31311701 has 2 divisors, whose sum is σ = 31311702. Its totient is φ = 31311700.

The previous prime is 31311689. The next prime is 31311703. The reversal of 31311701 is 10711313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 12432676 = 4345^2 + 3526^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311701 - 2¹⁰ = 31310677 is a prime.

Together with 31311703, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31311701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31311703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655850 + 15655851.

It is an arithmetic number, because the mean of its divisors is an integer number (15655851).

Almost surely, 2^31311701 is an apocalyptic number.

It is an amenable number.

31311701 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311701 is an equidigital number, since it uses as much as digits as its factorization.

31311701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63, while the sum is 17.

The square root of 31311701 is about 5595.6859275696. The cubic root of 31311701 is about 315.1874285582.

The spelling of 31311701 in words is "thirty-one million, three hundred eleven thousand, seven hundred one".