130991985 has 80 divisors (see below), whose sum is σ = 256132800. Its totient is φ = 63794304.

The previous prime is 130991983. The next prime is 130992013. The reversal of 130991985 is 589199031.

It is not a de Polignac number, because 130991985 - 2¹ = 130991983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 130991985.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130991981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 222862 + ... + 223448.

It is an arithmetic number, because the mean of its divisors is an integer number (3201660).

Almost surely, 2^130991985 is an apocalyptic number.

130991985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

130991985 is a deficient number, since it is larger than the sum of its proper divisors (125140815).

130991985 is a wasteful number, since it uses less digits than its factorization.

130991985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 130991985 is about 11445.1730000031. The cubic root of 130991985 is about 507.8649497888.

The spelling of 130991985 in words is "one hundred thirty million, nine hundred ninety-one thousand, nine hundred eighty-five".