19504913 has 2 divisors, whose sum is σ = 19504914. Its totient is φ = 19504912.

The previous prime is 19504909. The next prime is 19504931. The reversal of 19504913 is 31940591.

Together with next prime (19504931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10061584 + 9443329 = 3172^2 + 3073^2 .

It is a cyclic number.

It is not a de Polignac number, because 19504913 - 2² = 19504909 is a prime.

It is a super-2 number, since 2×19504913² = 760883262275138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19504913.

It is not a weakly prime, because it can be changed into another prime (19504813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9752456 + 9752457.

It is an arithmetic number, because the mean of its divisors is an integer number (9752457).

Almost surely, 2^19504913 is an apocalyptic number.

It is an amenable number.

19504913 is a deficient number, since it is larger than the sum of its proper divisors (1).

19504913 is an equidigital number, since it uses as much as digits as its factorization.

19504913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 19504913 is about 4416.4366858362. The cubic root of 19504913 is about 269.1832335981.

The spelling of 19504913 in words is "nineteen million, five hundred four thousand, nine hundred thirteen".