1531665532 has 6 divisors (see below), whose sum is σ = 2680414688. Its totient is φ = 765832764.

The previous prime is 1531665529. The next prime is 1531665533. The reversal of 1531665532 is 2355661351.

It is a junction number, because it is equal to n+sod(n) for n = 1531665491 and 1531665500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531665533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191458188 + ... + 191458195.

Almost surely, 2^1531665532 is an apocalyptic number.

It is an amenable number.

1531665532 is a deficient number, since it is larger than the sum of its proper divisors (1148749156).

1531665532 is a wasteful number, since it uses less digits than its factorization.

1531665532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382916387 (or 382916385 counting only the distinct ones).

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

The square root of 1531665532 is about 39136.4987192263. The cubic root of 1531665532 is about 1152.7133239286.

The spelling of 1531665532 in words is "one billion, five hundred thirty-one million, six hundred sixty-five thousand, five hundred thirty-two".