3645531 has 12 divisors (see below), whose sum is σ = 5575752. Its totient is φ = 2287296.

The previous prime is 3645527. The next prime is 3645533. The reversal of 3645531 is 1355463.

It is not a de Polignac number, because 3645531 - 2² = 3645527 is a prime.

It is a super-2 number, since 2×3645531² = 26579792543922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3645495 and 3645504.

It is not an unprimeable number, because it can be changed into a prime (3645533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11761 + ... + 12066.

It is an arithmetic number, because the mean of its divisors is an integer number (464646).

Almost surely, 2^3645531 is an apocalyptic number.

3645531 is a deficient number, since it is larger than the sum of its proper divisors (1930221).

3645531 is a wasteful number, since it uses less digits than its factorization.

3645531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23850 (or 23847 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 3645531 is about 1909.3273684730. The cubic root of 3645531 is about 153.9053080662.

The spelling of 3645531 in words is "three million, six hundred forty-five thousand, five hundred thirty-one".