1918131512 has 32 divisors (see below), whose sum is σ = 3926934000. Its totient is φ = 871104000.

The previous prime is 1918131511. The next prime is 1918131521. The reversal of 1918131512 is 2151318191.

It is a happy number.

It is a super-2 number, since 2×1918131512² = 7358456994654812288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918131511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96614 + ... + 114762.

Almost surely, 2^1918131512 is an apocalyptic number.

It is an amenable number.

1918131512 is an abundant number, since it is smaller than the sum of its proper divisors (2008802488).

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

1918131512 is a wasteful number, since it uses less digits than its factorization.

1918131512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19367 (or 19363 counting only the distinct ones).

The product of its digits is 2160, while the sum is 32.

The square root of 1918131512 is about 43796.4783059095. The cubic root of 1918131512 is about 1242.4896891160.

The spelling of 1918131512 in words is "one billion, nine hundred eighteen million, one hundred thirty-one thousand, five hundred twelve".