31390903 has 4 divisors (see below), whose sum is σ = 32120968. Its totient is φ = 30660840.

The previous prime is 31390897. The next prime is 31390913. The reversal of 31390903 is 30909313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30909313 = 577 ⋅53569.

It is a cyclic number.

It is not a de Polignac number, because 31390903 - 2¹³ = 31382711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31390913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364968 + ... + 365053.

It is an arithmetic number, because the mean of its divisors is an integer number (8030242).

Almost surely, 2^31390903 is an apocalyptic number.

31390903 is a deficient number, since it is larger than the sum of its proper divisors (730065).

31390903 is an equidigital number, since it uses as much as digits as its factorization.

31390903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730064.

The product of its (nonzero) digits is 2187, while the sum is 28.

The square root of 31390903 is about 5602.7585170164. The cubic root of 31390903 is about 315.4529571554.

The spelling of 31390903 in words is "thirty-one million, three hundred ninety thousand, nine hundred three".