19695923531 has 2 divisors, whose sum is σ = 19695923532. Its totient is φ = 19695923530.

The previous prime is 19695923497. The next prime is 19695923543. The reversal of 19695923531 is 13532959691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19695923531 is a prime.

It is a super-2 number, since 2×19695923531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19695923551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9847961765 + 9847961766.

It is an arithmetic number, because the mean of its divisors is an integer number (9847961766).

Almost surely, 2^19695923531 is an apocalyptic number.

19695923531 is a deficient number, since it is larger than the sum of its proper divisors (1).

19695923531 is an equidigital number, since it uses as much as digits as its factorization.

19695923531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1968300, while the sum is 53.

The spelling of 19695923531 in words is "nineteen billion, six hundred ninety-five million, nine hundred twenty-three thousand, five hundred thirty-one".