31315423 has 2 divisors, whose sum is σ = 31315424. Its totient is φ = 31315422.

The previous prime is 31315393. The next prime is 31315441. The reversal of 31315423 is 32451313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31315423 - 2⁹ = 31314911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31315394 and 31315403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31315463) 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 as a sum of consecutive naturals, namely, 15657711 + 15657712.

It is an arithmetic number, because the mean of its divisors is an integer number (15657712).

Almost surely, 2^31315423 is an apocalyptic number.

31315423 is a deficient number, since it is larger than the sum of its proper divisors (1).

31315423 is an equidigital number, since it uses as much as digits as its factorization.

31315423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 22.

The square root of 31315423 is about 5596.0184953233. The cubic root of 31315423 is about 315.1999167665.

Adding to 31315423 its reverse (32451313), we get a palindrome (63766736).

The spelling of 31315423 in words is "thirty-one million, three hundred fifteen thousand, four hundred twenty-three".