3721651 has 4 divisors (see below), whose sum is σ = 3725512. Its totient is φ = 3717792.

The previous prime is 3721631. The next prime is 3721673. The reversal of 3721651 is 1561273.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3721651 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721621) 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, 880 + ... + 2866.

It is an arithmetic number, because the mean of its divisors is an integer number (931378).

Almost surely, 2^3721651 is an apocalyptic number.

3721651 is a deficient number, since it is larger than the sum of its proper divisors (3861).

3721651 is a wasteful number, since it uses less digits than its factorization.

3721651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3860.

The product of its digits is 1260, while the sum is 25.

The square root of 3721651 is about 1929.1581065325. The cubic root of 3721651 is about 154.9691371087.

The spelling of 3721651 in words is "three million, seven hundred twenty-one thousand, six hundred fifty-one".