81017035919 has 2 divisors, whose sum is σ = 81017035920. Its totient is φ = 81017035918.

The previous prime is 81017035909. The next prime is 81017035927. The reversal of 81017035919 is 91953071018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81017035919 - 2³² = 76722068623 is a prime.

It is a super-2 number, since 2×81017035919² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81017035919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81017035909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40508517959 + 40508517960.

It is an arithmetic number, because the mean of its divisors is an integer number (40508517960).

Almost surely, 2^81017035919 is an apocalyptic number.

81017035919 is a deficient number, since it is larger than the sum of its proper divisors (1).

81017035919 is an equidigital number, since it uses as much as digits as its factorization.

81017035919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 81017035919 in words is "eighty-one billion, seventeen million, thirty-five thousand, nine hundred nineteen".