3215665531 has 8 divisors (see below), whose sum is σ = 3479439824. Its totient is φ = 2954236320.

The previous prime is 3215665499. The next prime is 3215665553. The reversal of 3215665531 is 1355665123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3215665531 - 2⁵ = 3215665499 is a prime.

It is a super-2 number, since 2×3215665531² = 20681009614523023922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3215665561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583416 + ... + 588901.

It is an arithmetic number, because the mean of its divisors is an integer number (434929978).

Almost surely, 2^3215665531 is an apocalyptic number.

3215665531 is a deficient number, since it is larger than the sum of its proper divisors (263774293).

3215665531 is a wasteful number, since it uses less digits than its factorization.

3215665531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172541.

The product of its digits is 81000, while the sum is 37.

The square root of 3215665531 is about 56706.8384853185. The cubic root of 3215665531 is about 1476.0133656433.

It can be divided in two parts, 3215 and 665531, that added together give a triangular number (668746 = T₁₁₅₆).

The spelling of 3215665531 in words is "three billion, two hundred fifteen million, six hundred sixty-five thousand, five hundred thirty-one".