1804995491 has 16 divisors (see below), whose sum is σ = 2016150528. Its totient is φ = 1604685600.

The previous prime is 1804995487. The next prime is 1804995499. The reversal of 1804995491 is 1945994081.

It is a cyclic number.

It is not a de Polignac number, because 1804995491 - 2² = 1804995487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1804995499) 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, 74420 + ... + 95646.

It is an arithmetic number, because the mean of its divisors is an integer number (126009408).

Almost surely, 2^1804995491 is an apocalyptic number.

1804995491 is a deficient number, since it is larger than the sum of its proper divisors (211155037).

1804995491 is a wasteful number, since it uses less digits than its factorization.

1804995491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21482.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1804995491 is about 42485.2385070391. The cubic root of 1804995491 is about 1217.5646776705.

The spelling of 1804995491 in words is "one billion, eight hundred four million, nine hundred ninety-five thousand, four hundred ninety-one".