31982987 has 2 divisors, whose sum is σ = 31982988. Its totient is φ = 31982986.

The previous prime is 31982957. The next prime is 31983011. The reversal of 31982987 is 78928913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31982987 - 2¹⁴ = 31966603 is a prime.

It is a super-2 number, since 2×31982987² = 2045822914884338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31982957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15991493 + 15991494.

It is an arithmetic number, because the mean of its divisors is an integer number (15991494).

Almost surely, 2^31982987 is an apocalyptic number.

31982987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31982987 is an equidigital number, since it uses as much as digits as its factorization.

31982987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 31982987 is about 5655.3502986110. The cubic root of 31982987 is about 317.4239369737.

It can be divided in two parts, 3198298 and 7, that multiplied together give a triangular number (22388086 = T₆₆₉₁).

The spelling of 31982987 in words is "thirty-one million, nine hundred eighty-two thousand, nine hundred eighty-seven".