31296288881 has 24 divisors (see below), whose sum is σ = 38804721984. Its totient is φ = 24880335840.

The previous prime is 31296288869. The next prime is 31296288943. The reversal of 31296288881 is 18888269213.

It is a happy number.

It is not a de Polignac number, because 31296288881 - 2¹⁰ = 31296287857 is a prime.

It is a super-2 number, since 2×31296288881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31296288581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251501 + ... + 354746.

It is an arithmetic number, because the mean of its divisors is an integer number (1616863416).

Almost surely, 2^31296288881 is an apocalyptic number.

It is an amenable number.

31296288881 is a deficient number, since it is larger than the sum of its proper divisors (7508433103).

31296288881 is a wasteful number, since it uses less digits than its factorization.

31296288881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606309 (or 606290 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 56.

The spelling of 31296288881 in words is "thirty-one billion, two hundred ninety-six million, two hundred eighty-eight thousand, eight hundred eighty-one".