1599394661 has 2 divisors, whose sum is σ = 1599394662. Its totient is φ = 1599394660.

The previous prime is 1599394637. The next prime is 1599394669. The reversal of 1599394661 is 1664939951.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1437850561 + 161544100 = 37919^2 + 12710^2 .

It is an emirp because it is prime and its reverse (1664939951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1599394661 - 2³⁰ = 525652837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1599394669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 799697330 + 799697331.

It is an arithmetic number, because the mean of its divisors is an integer number (799697331).

Almost surely, 2^1599394661 is an apocalyptic number.

It is an amenable number.

1599394661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1599394661 is an equidigital number, since it uses as much as digits as its factorization.

1599394661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 53.

The square root of 1599394661 is about 39992.4325466706. The cubic root of 1599394661 is about 1169.4595748483.

The spelling of 1599394661 in words is "one billion, five hundred ninety-nine million, three hundred ninety-four thousand, six hundred sixty-one".