31691357419 has 2 divisors, whose sum is σ = 31691357420. Its totient is φ = 31691357418.

The previous prime is 31691357377. The next prime is 31691357431. The reversal of 31691357419 is 91475319613.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31691357419 - 2²⁵ = 31657802987 is a prime.

It is a super-2 number, since 2×31691357419² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31691357519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15845678709 + 15845678710.

It is an arithmetic number, because the mean of its divisors is an integer number (15845678710).

Almost surely, 2^31691357419 is an apocalyptic number.

31691357419 is a deficient number, since it is larger than the sum of its proper divisors (1).

31691357419 is an equidigital number, since it uses as much as digits as its factorization.

31691357419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The spelling of 31691357419 in words is "thirty-one billion, six hundred ninety-one million, three hundred fifty-seven thousand, four hundred nineteen".