1639162897 has 2 divisors, whose sum is σ = 1639162898. Its totient is φ = 1639162896.

The previous prime is 1639162883. The next prime is 1639162963. The reversal of 1639162897 is 7982619361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1513521216 + 125641681 = 38904^2 + 11209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639162897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1639162807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819581448 + 819581449.

It is an arithmetic number, because the mean of its divisors is an integer number (819581449).

Almost surely, 2^1639162897 is an apocalyptic number.

It is an amenable number.

1639162897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639162897 is an equidigital number, since it uses as much as digits as its factorization.

1639162897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 1639162897 is about 40486.5767508195. The cubic root of 1639162897 is about 1179.0730288138.

The spelling of 1639162897 in words is "one billion, six hundred thirty-nine million, one hundred sixty-two thousand, eight hundred ninety-seven".