131545991 has 8 divisors (see below), whose sum is σ = 134415600. Its totient is φ = 128703168.

The previous prime is 131545969. The next prime is 131546003. The reversal of 131545991 is 199545131.

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 131545991 - 2¹⁸ = 131283847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131545391) 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, 3395 + ... + 16571.

It is an arithmetic number, because the mean of its divisors is an integer number (16801950).

Almost surely, 2^131545991 is an apocalyptic number.

131545991 is a deficient number, since it is larger than the sum of its proper divisors (2869609).

131545991 is a wasteful number, since it uses less digits than its factorization.

131545991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13393.

The product of its digits is 24300, while the sum is 38.

The square root of 131545991 is about 11469.3500687702. The cubic root of 131545991 is about 508.5799159381.

The spelling of 131545991 in words is "one hundred thirty-one million, five hundred forty-five thousand, nine hundred ninety-one".