31521513332 has 6 divisors (see below), whose sum is σ = 55162648338. Its totient is φ = 15760756664.

The previous prime is 31521513311. The next prime is 31521513347. The reversal of 31521513332 is 23331512513.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28091771236 + 3429742096 = 167606^2 + 58564^2 .

It is a super-3 number, since 3×31521513332³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31521513295 and 31521513304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940189163 + ... + 3940189170.

It is an arithmetic number, because the mean of its divisors is an integer number (9193774723).

Almost surely, 2^31521513332 is an apocalyptic number.

It is an amenable number.

31521513332 is a deficient number, since it is larger than the sum of its proper divisors (23641135006).

31521513332 is a wasteful number, since it uses less digits than its factorization.

31521513332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7880378337 (or 7880378335 counting only the distinct ones).

The product of its digits is 8100, while the sum is 29.

The spelling of 31521513332 in words is "thirty-one billion, five hundred twenty-one million, five hundred thirteen thousand, three hundred thirty-two".