31275701 has 2 divisors, whose sum is σ = 31275702. Its totient is φ = 31275700.

The previous prime is 31275689. The next prime is 31275703. The reversal of 31275701 is 10757213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29964676 + 1311025 = 5474^2 + 1145^2 .

It is an emirp because it is prime and its reverse (10757213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31275701 is a prime.

Together with 31275703, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31275703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15637850 + 15637851.

It is an arithmetic number, because the mean of its divisors is an integer number (15637851).

Almost surely, 2^31275701 is an apocalyptic number.

It is an amenable number.

31275701 is a deficient number, since it is larger than the sum of its proper divisors (1).

31275701 is an equidigital number, since it uses as much as digits as its factorization.

31275701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 31275701 is about 5592.4682386224. The cubic root of 31275701 is about 315.0665887613.

The spelling of 31275701 in words is "thirty-one million, two hundred seventy-five thousand, seven hundred one".