31988427310081 has 16 divisors (see below), whose sum is σ = 36102340463040. Its totient is φ = 28075634758080.

The previous prime is 31988427310079. The next prime is 31988427310097. The reversal of 31988427310081 is 18001372488913.

It is a cyclic number.

It is not a de Polignac number, because 31988427310081 - 2¹ = 31988427310079 is a prime.

It is a super-2 number, since 2×31988427310081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31988427311081) 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, 997210 + ... + 8060476.

It is an arithmetic number, because the mean of its divisors is an integer number (2256396278940).

Almost surely, 2^{31988427310081} is an apocalyptic number.

It is an amenable number.

31988427310081 is a deficient number, since it is larger than the sum of its proper divisors (4113913152959).

31988427310081 is a wasteful number, since it uses less digits than its factorization.

31988427310081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077504.

The product of its (nonzero) digits is 2322432, while the sum is 55.

Adding to 31988427310081 its reverse (18001372488913), we get a palindrome (49989799798994).

The spelling of 31988427310081 in words is "thirty-one trillion, nine hundred eighty-eight billion, four hundred twenty-seven million, three hundred ten thousand, eighty-one".