131855691 has 8 divisors (see below), whose sum is σ = 191790144. Its totient is φ = 79912520.

The previous prime is 131855683. The next prime is 131855693. The reversal of 131855691 is 196558131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131855691 - 2³ = 131855683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131855693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1997781 + ... + 1997846.

It is an arithmetic number, because the mean of its divisors is an integer number (23973768).

Almost surely, 2^131855691 is an apocalyptic number.

131855691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131855691 is a deficient number, since it is larger than the sum of its proper divisors (59934453).

131855691 is a wasteful number, since it uses less digits than its factorization.

131855691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3995641.

The product of its digits is 32400, while the sum is 39.

The square root of 131855691 is about 11482.8433325549. The cubic root of 131855691 is about 508.9787213376.

The spelling of 131855691 in words is "one hundred thirty-one million, eight hundred fifty-five thousand, six hundred ninety-one".