1639495061 has 2 divisors, whose sum is σ = 1639495062. Its totient is φ = 1639495060.

The previous prime is 1639495027. The next prime is 1639495073. The reversal of 1639495061 is 1605949361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1470339025 + 169156036 = 38345^2 + 13006^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639495061 - 2²² = 1635300757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1639495001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819747530 + 819747531.

It is an arithmetic number, because the mean of its divisors is an integer number (819747531).

Almost surely, 2^1639495061 is an apocalyptic number.

It is an amenable number.

1639495061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639495061 is an equidigital number, since it uses as much as digits as its factorization.

1639495061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 1639495061 is about 40490.6786927559. The cubic root of 1639495061 is about 1179.1526668539.

The spelling of 1639495061 in words is "one billion, six hundred thirty-nine million, four hundred ninety-five thousand, sixty-one".