31316387 has 2 divisors, whose sum is σ = 31316388. Its totient is φ = 31316386.

The previous prime is 31316381. The next prime is 31316413. The reversal of 31316387 is 78361313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31316387 - 2⁶ = 31316323 is a prime.

It is not a weakly prime, because it can be changed into another prime (31316381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15658193 + 15658194.

It is an arithmetic number, because the mean of its divisors is an integer number (15658194).

Almost surely, 2^31316387 is an apocalyptic number.

31316387 is a deficient number, since it is larger than the sum of its proper divisors (1).

31316387 is an equidigital number, since it uses as much as digits as its factorization.

31316387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 31316387 is about 5596.1046273278. The cubic root of 31316387 is about 315.2031510578.

The spelling of 31316387 in words is "thirty-one million, three hundred sixteen thousand, three hundred eighty-seven".