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3651 = 31217

3651 has 4 divisors (see below), whose sum is σ = 4872. Its totient is φ = 2432.

The previous prime is 3643. The next prime is 3659. The reversal of 3651 is 1563.

3651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1563 = 3521.

It is an interprime number because it is at equal distance from previous prime (3643) and next prime (3659).

It is a cyclic number.

It is not a de Polignac number, because 3651 - 23 = 3643 is a prime.

It is a D-number.

It is a plaindrome in base 14 and base 15.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 3651.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 3651.

It is not an unprimeable number, because it can be changed into a prime (3659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606 + ... + 611.

It is an arithmetic number, because the mean of its divisors is an integer number (1218).

23651 is an apocalyptic number.

3651 is a deficient number, since it is larger than the sum of its proper divisors (1221).

3651 is a wasteful number, since it uses less digits than its factorization.

3651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220.

The product of its digits is 90, while the sum is 15.

The square root of 3651 is about 60.4235053601. The cubic root of 3651 is about 15.3982232166.

Adding to 3651 its product of digits (90), we get a triangular number (3741 = T86).

It can be divided in two parts, 3 and 651, that multiplied together give a triangular number (1953 = T62).

The spelling of 3651 in words is "three thousand, six hundred fifty-one".

Divisors: 1 3 1217 3651