3651651 has 24 divisors (see below), whose sum is σ = 5784480. Its totient is φ = 2209536.

The previous prime is 3651623. The next prime is 3651653. The reversal of 3651651 is 1561563.

It is a happy number.

3651651 is a `hidden beast` number, since 3 + 6 + 5 + 1 + 651 = 666.

It is not a de Polignac number, because 3651651 - 2⁵ = 3651619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3651653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4026 + ... + 4848.

It is an arithmetic number, because the mean of its divisors is an integer number (241020).

Almost surely, 2^3651651 is an apocalyptic number.

3651651 is a deficient number, since it is larger than the sum of its proper divisors (2132829).

3651651 is a wasteful number, since it uses less digits than its factorization.

3651651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 872 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 3651651 is about 1910.9293550521. The cubic root of 3651651 is about 153.9913836749.

It can be divided in two parts, 365 and 1651, that added together give a triangular number (2016 = T₆₃).

The spelling of 3651651 in words is "three million, six hundred fifty-one thousand, six hundred fifty-one".