19161913 has 2 divisors, whose sum is σ = 19161914. Its totient is φ = 19161912.

The previous prime is 19161889. The next prime is 19161929. The reversal of 19161913 is 31916191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12334144 + 6827769 = 3512^2 + 2613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19161913 is a prime.

It is not a weakly prime, because it can be changed into another prime (19161943) 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, 9580956 + 9580957.

It is an arithmetic number, because the mean of its divisors is an integer number (9580957).

Almost surely, 2^19161913 is an apocalyptic number.

It is an amenable number.

19161913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19161913 is an equidigital number, since it uses as much as digits as its factorization.

19161913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 31.

The square root of 19161913 is about 4377.4322381963. The cubic root of 19161913 is about 267.5960024591.

The spelling of 19161913 in words is "nineteen million, one hundred sixty-one thousand, nine hundred thirteen".