31820537725 has 12 divisors (see below), whose sum is σ = 39551203060. Its totient is φ = 25395955200.

The previous prime is 31820537711. The next prime is 31820537737. The reversal of 31820537725 is 52773502813.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 12793645881 + 19026891844 = 113109^2 + 137938^2 .

It is not a de Polignac number, because 31820537725 - 2³³ = 23230603133 is a prime.

It is a super-3 number, since 3×31820537725³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1501140 + ... + 1522189.

Almost surely, 2^31820537725 is an apocalyptic number.

It is an amenable number.

31820537725 is a deficient number, since it is larger than the sum of its proper divisors (7730665335).

31820537725 is a wasteful number, since it uses less digits than its factorization.

31820537725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023760 (or 3023755 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 31820537725 in words is "thirty-one billion, eight hundred twenty million, five hundred thirty-seven thousand, seven hundred twenty-five".