31352520081 has 16 divisors (see below), whose sum is σ = 43625005056. Its totient is φ = 19991028816.

The previous prime is 31352520029. The next prime is 31352520109. The reversal of 31352520081 is 18002525313.

It is a de Polignac number, because none of the positive numbers 2^k-31352520081 is a prime.

It is a super-2 number, since 2×31352520081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31352520481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1339626 + ... + 1362828.

It is an arithmetic number, because the mean of its divisors is an integer number (2726562816).

Almost surely, 2^31352520081 is an apocalyptic number.

It is an amenable number.

31352520081 is a deficient number, since it is larger than the sum of its proper divisors (12272484975).

31352520081 is a wasteful number, since it uses less digits than its factorization.

31352520081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42812.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 31352520081 in words is "thirty-one billion, three hundred fifty-two million, five hundred twenty thousand, eighty-one".