31751280881 has 2 divisors, whose sum is σ = 31751280882. Its totient is φ = 31751280880.

The previous prime is 31751280839. The next prime is 31751280917. The reversal of 31751280881 is 18808215713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31429616656 + 321664225 = 177284^2 + 17935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31751280881 is a prime.

It is a super-2 number, since 2×31751280881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31751286881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15875640440 + 15875640441.

It is an arithmetic number, because the mean of its divisors is an integer number (15875640441).

Almost surely, 2^31751280881 is an apocalyptic number.

It is an amenable number.

31751280881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31751280881 is an equidigital number, since it uses as much as digits as its factorization.

31751280881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 44.

The spelling of 31751280881 in words is "thirty-one billion, seven hundred fifty-one million, two hundred eighty thousand, eight hundred eighty-one".