31426987 has 2 divisors, whose sum is σ = 31426988. Its totient is φ = 31426986.

The previous prime is 31426939. The next prime is 31427003. The reversal of 31426987 is 78962413.

It is a strong prime.

It is an emirp because it is prime and its reverse (78962413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31426987 - 2⁷ = 31426859 is a prime.

It is not a weakly prime, because it can be changed into another prime (31426907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15713493 + 15713494.

It is an arithmetic number, because the mean of its divisors is an integer number (15713494).

Almost surely, 2^31426987 is an apocalyptic number.

31426987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31426987 is an equidigital number, since it uses as much as digits as its factorization.

31426987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 31426987 is about 5605.9777916078. The cubic root of 31426987 is about 315.5737824548.

The spelling of 31426987 in words is "thirty-one million, four hundred twenty-six thousand, nine hundred eighty-seven".