31388671 has 2 divisors, whose sum is σ = 31388672. Its totient is φ = 31388670.

The previous prime is 31388663. The next prime is 31388683. The reversal of 31388671 is 17688313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31388671 - 2³ = 31388663 is a prime.

It is a Chen prime.

It is equal to p_1938439 and since 31388671 and 1938439 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31388671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31389671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15694335 + 15694336.

It is an arithmetic number, because the mean of its divisors is an integer number (15694336).

Almost surely, 2^31388671 is an apocalyptic number.

31388671 is a deficient number, since it is larger than the sum of its proper divisors (1).

31388671 is an equidigital number, since it uses as much as digits as its factorization.

31388671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 31388671 is about 5602.5593258796. The cubic root of 31388671 is about 315.4454803854.

The spelling of 31388671 in words is "thirty-one million, three hundred eighty-eight thousand, six hundred seventy-one".