19669957 has 2 divisors, whose sum is σ = 19669958. Its totient is φ = 19669956.

The previous prime is 19669931. The next prime is 19669967. The reversal of 19669957 is 75996691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 8014561 = 3414^2 + 2831^2 .

It is an emirp because it is prime and its reverse (75996691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19669957 - 2¹⁹ = 19145669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19669907) 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, 9834978 + 9834979.

It is an arithmetic number, because the mean of its divisors is an integer number (9834979).

Almost surely, 2^19669957 is an apocalyptic number.

It is an amenable number.

19669957 is a deficient number, since it is larger than the sum of its proper divisors (1).

19669957 is an equidigital number, since it uses as much as digits as its factorization.

19669957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 52.

The square root of 19669957 is about 4435.0825245986. The cubic root of 19669957 is about 269.9403480473.

The spelling of 19669957 in words is "nineteen million, six hundred sixty-nine thousand, nine hundred fifty-seven".