31310893 has 2 divisors, whose sum is σ = 31310894. Its totient is φ = 31310892.

The previous prime is 31310891. The next prime is 31310897. The reversal of 31310893 is 39801313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26234884 + 5076009 = 5122^2 + 2253^2 .

It is a cyclic number.

It is not a de Polignac number, because 31310893 - 2¹ = 31310891 is a prime.

Together with 31310891, 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 (31310891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655446 + 15655447.

It is an arithmetic number, because the mean of its divisors is an integer number (15655447).

Almost surely, 2^31310893 is an apocalyptic number.

It is an amenable number.

31310893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310893 is an equidigital number, since it uses as much as digits as its factorization.

31310893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31310893 is about 5595.6137286271. The cubic root of 31310893 is about 315.1847173925.

The spelling of 31310893 in words is "thirty-one million, three hundred ten thousand, eight hundred ninety-three".