31057919 has 2 divisors, whose sum is σ = 31057920. Its totient is φ = 31057918.

The previous prime is 31057909. The next prime is 31057921. The reversal of 31057919 is 91975013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31057919 - 2¹² = 31053823 is a prime.

It is a super-2 number, since 2×31057919² = 1929188665221122, which contains 22 as substring.

Together with 31057921, 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 (31057909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15528959 + 15528960.

It is an arithmetic number, because the mean of its divisors is an integer number (15528960).

Almost surely, 2^31057919 is an apocalyptic number.

31057919 is a deficient number, since it is larger than the sum of its proper divisors (1).

31057919 is an equidigital number, since it uses as much as digits as its factorization.

31057919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 31057919 is about 5572.9632153819. The cubic root of 31057919 is about 314.3335839816. Note that the first 3 decimals are identical.

The spelling of 31057919 in words is "thirty-one million, fifty-seven thousand, nine hundred nineteen".