19510912979 has 2 divisors, whose sum is σ = 19510912980. Its totient is φ = 19510912978.

The previous prime is 19510912963. The next prime is 19510913029. The reversal of 19510912979 is 97921901591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19510912979 - 2⁴ = 19510912963 is a prime.

It is a super-2 number, since 2×19510912979² (a number of 21 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 19510912979.

It is not a weakly prime, because it can be changed into another prime (19510912079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9755456489 + 9755456490.

It is an arithmetic number, because the mean of its divisors is an integer number (9755456490).

Almost surely, 2^19510912979 is an apocalyptic number.

19510912979 is a deficient number, since it is larger than the sum of its proper divisors (1).

19510912979 is an equidigital number, since it uses as much as digits as its factorization.

19510912979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 459270, while the sum is 53.

The spelling of 19510912979 in words is "nineteen billion, five hundred ten million, nine hundred twelve thousand, nine hundred seventy-nine".