31088987 has 2 divisors, whose sum is σ = 31088988. Its totient is φ = 31088986.

The previous prime is 31088933. The next prime is 31088989. The reversal of 31088987 is 78988013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31088987 - 2⁶ = 31088923 is a prime.

It is a super-2 number, since 2×31088987² = 1933050225372338, which contains 22 as substring.

Together with 31088989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31088989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15544493 + 15544494.

It is an arithmetic number, because the mean of its divisors is an integer number (15544494).

Almost surely, 2^31088987 is an apocalyptic number.

31088987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31088987 is an equidigital number, since it uses as much as digits as its factorization.

31088987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 31088987 is about 5575.7499047213. The cubic root of 31088987 is about 314.4383609232.

The spelling of 31088987 in words is "thirty-one million, eighty-eight thousand, nine hundred eighty-seven".