1597636409 has 2 divisors, whose sum is σ = 1597636410. Its totient is φ = 1597636408.

The previous prime is 1597636349. The next prime is 1597636471. The reversal of 1597636409 is 9046367951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155796009 + 441840400 = 33997^2 + 21020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1597636409 - 2²⁰ = 1596587833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1597636009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798818204 + 798818205.

It is an arithmetic number, because the mean of its divisors is an integer number (798818205).

Almost surely, 2^1597636409 is an apocalyptic number.

It is an amenable number.

1597636409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1597636409 is an equidigital number, since it uses as much as digits as its factorization.

1597636409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 1597636409 is about 39970.4441931785. Note that the first 3 decimals coincide. The cubic root of 1597636409 is about 1169.0308796207.

The spelling of 1597636409 in words is "one billion, five hundred ninety-seven million, six hundred thirty-six thousand, four hundred nine".