19555969 has 2 divisors, whose sum is σ = 19555970. Its totient is φ = 19555968.

The previous prime is 19555951. The next prime is 19555979. The reversal of 19555969 is 96955591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12873744 + 6682225 = 3588^2 + 2585^2 .

It is an emirp because it is prime and its reverse (96955591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19555969 - 2⁵ = 19555937 is a prime.

It is a super-2 number, since 2×19555969² = 764871847057922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19555919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9777984 + 9777985.

It is an arithmetic number, because the mean of its divisors is an integer number (9777985).

Almost surely, 2^19555969 is an apocalyptic number.

It is an amenable number.

19555969 is a deficient number, since it is larger than the sum of its proper divisors (1).

19555969 is an equidigital number, since it uses as much as digits as its factorization.

19555969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 546750, while the sum is 49.

The square root of 19555969 is about 4422.2131337148. The cubic root of 19555969 is about 269.4179000299.

The spelling of 19555969 in words is "nineteen million, five hundred fifty-five thousand, nine hundred sixty-nine".