31245887 has 2 divisors, whose sum is σ = 31245888. Its totient is φ = 31245886.

The previous prime is 31245833. The next prime is 31245889. The reversal of 31245887 is 78854213.

It is a strong prime.

It is an emirp because it is prime and its reverse (78854213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31245887 - 2⁸ = 31245631 is a prime.

Together with 31245889, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31245887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31245889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622943 + 15622944.

It is an arithmetic number, because the mean of its divisors is an integer number (15622944).

Almost surely, 2^31245887 is an apocalyptic number.

31245887 is a deficient number, since it is larger than the sum of its proper divisors (1).

31245887 is an equidigital number, since it uses as much as digits as its factorization.

31245887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 31245887 is about 5589.8020537404. The cubic root of 31245887 is about 314.9664430533.

The spelling of 31245887 in words is "thirty-one million, two hundred forty-five thousand, eight hundred eighty-seven".