31880887 has 2 divisors, whose sum is σ = 31880888. Its totient is φ = 31880886.

The previous prime is 31880873. The next prime is 31880897. The reversal of 31880887 is 78808813.

It is a strong prime.

It is an emirp because it is prime and its reverse (78808813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31880887 - 2²³ = 23492279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31880897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15940443 + 15940444.

It is an arithmetic number, because the mean of its divisors is an integer number (15940444).

Almost surely, 2^31880887 is an apocalyptic number.

31880887 is a deficient number, since it is larger than the sum of its proper divisors (1).

31880887 is an equidigital number, since it uses as much as digits as its factorization.

31880887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 31880887 is about 5646.3162327309. The cubic root of 31880887 is about 317.0858037458.

The spelling of 31880887 in words is "thirty-one million, eight hundred eighty thousand, eight hundred eighty-seven".