1801813959 has 24 divisors (see below), whose sum is σ = 2878126992. Its totient is φ = 1077045120.

The previous prime is 1801813891. The next prime is 1801813967. The reversal of 1801813959 is 9593181081.

1801813959 is a `hidden beast` number, since 1 + 80 + 181 + 395 + 9 = 666.

It is not a de Polignac number, because 1801813959 - 2⁷ = 1801813831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801813259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117432 + ... + 131885.

It is an arithmetic number, because the mean of its divisors is an integer number (119921958).

Almost surely, 2^1801813959 is an apocalyptic number.

1801813959 is a deficient number, since it is larger than the sum of its proper divisors (1076313033).

1801813959 is a wasteful number, since it uses less digits than its factorization.

1801813959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249407 (or 249404 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 45.

The square root of 1801813959 is about 42447.7791998592. The cubic root of 1801813959 is about 1216.8488865584.

The spelling of 1801813959 in words is "one billion, eight hundred one million, eight hundred thirteen thousand, nine hundred fifty-nine".