31312403 has 2 divisors, whose sum is σ = 31312404. Its totient is φ = 31312402.

The previous prime is 31312381. The next prime is 31312409. The reversal of 31312403 is 30421313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31312403 is a prime.

It is not a weakly prime, because it can be changed into another prime (31312409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656201 + 15656202.

It is an arithmetic number, because the mean of its divisors is an integer number (15656202).

Almost surely, 2^31312403 is an apocalyptic number.

31312403 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312403 is an equidigital number, since it uses as much as digits as its factorization.

31312403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31312403 is about 5595.7486541123. The cubic root of 31312403 is about 315.1897840134.

Adding to 31312403 its reverse (30421313), we get a palindrome (61733716).

The spelling of 31312403 in words is "thirty-one million, three hundred twelve thousand, four hundred three".