1604159491 has 16 divisors (see below), whose sum is σ = 1892367360. Its totient is φ = 1343332480.

The previous prime is 1604159489. The next prime is 1604159527. The reversal of 1604159491 is 1949514061.

It is a cyclic number.

It is not a de Polignac number, because 1604159491 - 2¹ = 1604159489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604150491) 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, 82471 + ... + 100048.

It is an arithmetic number, because the mean of its divisors is an integer number (118272960).

Almost surely, 2^1604159491 is an apocalyptic number.

1604159491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1604159491 is a deficient number, since it is larger than the sum of its proper divisors (288207869).

1604159491 is a wasteful number, since it uses less digits than its factorization.

1604159491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182594.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1604159491 is about 40051.9598896234. The cubic root of 1604159491 is about 1170.6197537170.

The spelling of 1604159491 in words is "one billion, six hundred four million, one hundred fifty-nine thousand, four hundred ninety-one".