131920785 has 16 divisors (see below), whose sum is σ = 234526080. Its totient is φ = 70357680.

The previous prime is 131920777. The next prime is 131920807. The reversal of 131920785 is 587029131.

It is not a de Polignac number, because 131920785 - 2³ = 131920777 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 488461 + ... + 488730.

It is an arithmetic number, because the mean of its divisors is an integer number (14657880).

Almost surely, 2^131920785 is an apocalyptic number.

131920785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131920785 is a deficient number, since it is larger than the sum of its proper divisors (102605295).

131920785 is an equidigital number, since it uses as much as digits as its factorization.

131920785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977205 (or 977199 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 131920785 is about 11485.6773853352. The cubic root of 131920785 is about 509.0624644309.

The spelling of 131920785 in words is "one hundred thirty-one million, nine hundred twenty thousand, seven hundred eighty-five".