19217900831 has 2 divisors, whose sum is σ = 19217900832. Its totient is φ = 19217900830.

The previous prime is 19217900809. The next prime is 19217900837. The reversal of 19217900831 is 13800971291.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19217900831 - 2¹⁰ = 19217899807 is a prime.

It is a super-2 number, since 2×19217900831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19217900837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9608950415 + 9608950416.

It is an arithmetic number, because the mean of its divisors is an integer number (9608950416).

Almost surely, 2^19217900831 is an apocalyptic number.

19217900831 is a deficient number, since it is larger than the sum of its proper divisors (1).

19217900831 is an equidigital number, since it uses as much as digits as its factorization.

19217900831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 19217900831 in words is "nineteen billion, two hundred seventeen million, nine hundred thousand, eight hundred thirty-one".