19590997 has 2 divisors, whose sum is σ = 19590998. Its totient is φ = 19590996.

The previous prime is 19590971. The next prime is 19591003. The reversal of 19590997 is 79909591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19589476 + 1521 = 4426^2 + 39^2 .

It is an emirp because it is prime and its reverse (79909591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19590997 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19590997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19590097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9795498 + 9795499.

It is an arithmetic number, because the mean of its divisors is an integer number (9795499).

Almost surely, 2^19590997 is an apocalyptic number.

It is an amenable number.

19590997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19590997 is an equidigital number, since it uses as much as digits as its factorization.

19590997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 19590997 is about 4426.1718222410. The cubic root of 19590997 is about 269.5786615394.

The spelling of 19590997 in words is "nineteen million, five hundred ninety thousand, nine hundred ninety-seven".