1809112520 has 32 divisors (see below), whose sum is σ = 4091611320. Its totient is φ = 719892480.

The previous prime is 1809112519. The next prime is 1809112553. The reversal of 1809112520 is 252119081.

It can be written as a sum of positive squares in 4 ways, for example, as 1594724356 + 214388164 = 39934^2 + 14642^2 .

It is a super-2 number, since 2×1809112520² = 6545776220041500800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109451 + ... + 124890.

Almost surely, 2^1809112520 is an apocalyptic number.

1809112520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1809112520 is an abundant number, since it is smaller than the sum of its proper divisors (2282498800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1809112520 is a wasteful number, since it uses less digits than its factorization.

1809112520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234545 (or 234541 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 1809112520 is about 42533.6633738501. The cubic root of 1809112520 is about 1218.4896924840.

The spelling of 1809112520 in words is "one billion, eight hundred nine million, one hundred twelve thousand, five hundred twenty".