1604871651 has 16 divisors (see below), whose sum is σ = 2307392640. Its totient is φ = 988879680.

The previous prime is 1604871623. The next prime is 1604871659. The reversal of 1604871651 is 1561784061.

It is not a de Polignac number, because 1604871651 - 2¹⁰ = 1604870627 is a prime.

It is a super-2 number, since 2×1604871651² = 5151226032366931602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1604871659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341025 + ... + 345698.

It is an arithmetic number, because the mean of its divisors is an integer number (144212040).

Almost surely, 2^1604871651 is an apocalyptic number.

1604871651 is a deficient number, since it is larger than the sum of its proper divisors (702520989).

1604871651 is a wasteful number, since it uses less digits than its factorization.

1604871651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686786.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 1604871651 is about 40060.8493544508. The cubic root of 1604871651 is about 1170.7929586947.

The spelling of 1604871651 in words is "one billion, six hundred four million, eight hundred seventy-one thousand, six hundred fifty-one".