31404887 has 2 divisors, whose sum is σ = 31404888. Its totient is φ = 31404886.

The previous prime is 31404881. The next prime is 31404889. The reversal of 31404887 is 78840413.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31404887 - 2⁸ = 31404631 is a prime.

Together with 31404889, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1939382 and since 31404887 and 1939382 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31404881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702443 + 15702444.

It is an arithmetic number, because the mean of its divisors is an integer number (15702444).

Almost surely, 2^31404887 is an apocalyptic number.

31404887 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404887 is an equidigital number, since it uses as much as digits as its factorization.

31404887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 31404887 is about 5604.0063347573. The cubic root of 31404887 is about 315.4997927972.

The spelling of 31404887 in words is "thirty-one million, four hundred four thousand, eight hundred eighty-seven".