31523113 has 2 divisors, whose sum is σ = 31523114. Its totient is φ = 31523112.

The previous prime is 31523111. The next prime is 31523119. The reversal of 31523113 is 31132513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24324624 + 7198489 = 4932^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 31523113 - 2¹ = 31523111 is a prime.

Together with 31523111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31523111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15761556 + 15761557.

It is an arithmetic number, because the mean of its divisors is an integer number (15761557).

Almost surely, 2^31523113 is an apocalyptic number.

It is an amenable number.

31523113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31523113 is an equidigital number, since it uses as much as digits as its factorization.

31523113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 19.

The square root of 31523113 is about 5614.5447722856. The cubic root of 31523113 is about 315.8952043947.

Adding to 31523113 its reverse (31132513), we get a palindrome (62655626).

The spelling of 31523113 in words is "thirty-one million, five hundred twenty-three thousand, one hundred thirteen".