31327987 has 2 divisors, whose sum is σ = 31327988. Its totient is φ = 31327986.

The previous prime is 31327943. The next prime is 31327999. The reversal of 31327987 is 78972313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31327987 - 2¹⁵ = 31295219 is a prime.

It is not a weakly prime, because it can be changed into another prime (31321987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15663993 + 15663994.

It is an arithmetic number, because the mean of its divisors is an integer number (15663994).

Almost surely, 2^31327987 is an apocalyptic number.

31327987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31327987 is an equidigital number, since it uses as much as digits as its factorization.

31327987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The square root of 31327987 is about 5597.1409666007. The cubic root of 31327987 is about 315.2420647123.

The spelling of 31327987 in words is "thirty-one million, three hundred twenty-seven thousand, nine hundred eighty-seven".