31396957519 has 2 divisors, whose sum is σ = 31396957520. Its totient is φ = 31396957518.

The previous prime is 31396957513. The next prime is 31396957589. The reversal of 31396957519 is 91575969313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31396957519 - 2⁷ = 31396957391 is a prime.

It is a super-2 number, since 2×31396957519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31396957513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15698478759 + 15698478760.

It is an arithmetic number, because the mean of its divisors is an integer number (15698478760).

Almost surely, 2^31396957519 is an apocalyptic number.

31396957519 is a deficient number, since it is larger than the sum of its proper divisors (1).

31396957519 is an equidigital number, since it uses as much as digits as its factorization.

31396957519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6889050, while the sum is 58.

The spelling of 31396957519 in words is "thirty-one billion, three hundred ninety-six million, nine hundred fifty-seven thousand, five hundred nineteen".