130991900 has 108 divisors (see below), whose sum is σ = 322135632. Its totient is φ = 46126080.

The previous prime is 130991897. The next prime is 130991911. The reversal of 130991900 is 9199031.

It is a super-2 number, since 2×130991900² = 34317755731220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 388532 + ... + 388868.

Almost surely, 2^130991900 is an apocalyptic number.

130991900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 130991900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161067816).

130991900 is an abundant number, since it is smaller than the sum of its proper divisors (191143732).

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

130991900 is a wasteful number, since it uses less digits than its factorization.

130991900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 130991900 is about 11445.1692866467. The cubic root of 130991900 is about 507.8648399385.

The spelling of 130991900 in words is "one hundred thirty million, nine hundred ninety-one thousand, nine hundred".