19972409593 has 2 divisors, whose sum is σ = 19972409594. Its totient is φ = 19972409592.

The previous prime is 19972409521. The next prime is 19972409609. The reversal of 19972409593 is 39590427991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19691947584 + 280462009 = 140328^2 + 16747^2 .

It is a cyclic number.

It is not a de Polignac number, because 19972409593 - 2¹³ = 19972401401 is a prime.

It is not a weakly prime, because it can be changed into another prime (19972409893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986204796 + 9986204797.

It is an arithmetic number, because the mean of its divisors is an integer number (9986204797).

Almost surely, 2^19972409593 is an apocalyptic number.

It is an amenable number.

19972409593 is a deficient number, since it is larger than the sum of its proper divisors (1).

19972409593 is an equidigital number, since it uses as much as digits as its factorization.

19972409593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The spelling of 19972409593 in words is "nineteen billion, nine hundred seventy-two million, four hundred nine thousand, five hundred ninety-three".