31373987 has 2 divisors, whose sum is σ = 31373988. Its totient is φ = 31373986.

The previous prime is 31373983. The next prime is 31373989. The reversal of 31373987 is 78937313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31373987 - 2² = 31373983 is a prime.

Together with 31373989, 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 (31373983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15686993 + 15686994.

It is an arithmetic number, because the mean of its divisors is an integer number (15686994).

Almost surely, 2^31373987 is an apocalyptic number.

31373987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31373987 is an equidigital number, since it uses as much as digits as its factorization.

31373987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 31373987 is about 5601.2487000668. The cubic root of 31373987 is about 315.3962829757.

The spelling of 31373987 in words is "thirty-one million, three hundred seventy-three thousand, nine hundred eighty-seven".