31948013 has 2 divisors, whose sum is σ = 31948014. Its totient is φ = 31948012.

The previous prime is 31948003. The next prime is 31948031. The reversal of 31948013 is 31084913.

Together with next prime (31948031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 11035684 = 4573^2 + 3322^2 .

It is an emirp because it is prime and its reverse (31084913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31948013 - 2⁸ = 31947757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31948003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15974006 + 15974007.

It is an arithmetic number, because the mean of its divisors is an integer number (15974007).

Almost surely, 2^31948013 is an apocalyptic number.

It is an amenable number.

31948013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31948013 is an equidigital number, since it uses as much as digits as its factorization.

31948013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 31948013 is about 5652.2573366753. The cubic root of 31948013 is about 317.3081917513.

The spelling of 31948013 in words is "thirty-one million, nine hundred forty-eight thousand, thirteen".