31542013 has 2 divisors, whose sum is σ = 31542014. Its totient is φ = 31542012.

The previous prime is 31542011. The next prime is 31542023. The reversal of 31542013 is 31024513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27688644 + 3853369 = 5262^2 + 1963^2 .

It is a cyclic number.

It is not a de Polignac number, because 31542013 - 2¹ = 31542011 is a prime.

Together with 31542011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771006 + 15771007.

It is an arithmetic number, because the mean of its divisors is an integer number (15771007).

Almost surely, 2^31542013 is an apocalyptic number.

It is an amenable number.

31542013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542013 is an equidigital number, since it uses as much as digits as its factorization.

31542013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31542013 is about 5616.2276485200. The cubic root of 31542013 is about 315.9583244991.

Subtracting from 31542013 its product of nonzero digits (360), we obtain a triangular number (31541653 = T₇₉₄₂).

Adding to 31542013 its reverse (31024513), we get a palindrome (62566526).

The spelling of 31542013 in words is "thirty-one million, five hundred forty-two thousand, thirteen".