19090979 has 2 divisors, whose sum is σ = 19090980. Its totient is φ = 19090978.

The previous prime is 19090969. The next prime is 19090997. The reversal of 19090979 is 97909091.

Together with next prime (19090997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19090979 - 2⁴ = 19090963 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (19090909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9545489 + 9545490.

It is an arithmetic number, because the mean of its divisors is an integer number (9545490).

Almost surely, 2^19090979 is an apocalyptic number.

19090979 is a deficient number, since it is larger than the sum of its proper divisors (1).

19090979 is an equidigital number, since it uses as much as digits as its factorization.

19090979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45927, while the sum is 44.

The square root of 19090979 is about 4369.3224875260. The cubic root of 19090979 is about 267.2653965437.

The spelling of 19090979 in words is "nineteen million, ninety thousand, nine hundred seventy-nine".