131995901 has 4 divisors (see below), whose sum is σ = 132126204. Its totient is φ = 131865600.

The previous prime is 131995891. The next prime is 131995931. The reversal of 131995901 is 109599131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109599131 = 43 ⋅2548817.

It can be written as a sum of positive squares in 2 ways, for example, as 111302500 + 20693401 = 10550^2 + 4549^2 .

It is a cyclic number.

It is not a de Polignac number, because 131995901 - 2¹⁸ = 131733757 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 (131995931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63620 + ... + 65661.

It is an arithmetic number, because the mean of its divisors is an integer number (33031551).

Almost surely, 2^131995901 is an apocalyptic number.

It is an amenable number.

131995901 is a deficient number, since it is larger than the sum of its proper divisors (130303).

131995901 is a wasteful number, since it uses less digits than its factorization.

131995901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130302.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 131995901 is about 11488.9469056132. The cubic root of 131995901 is about 509.1590665462.

The spelling of 131995901 in words is "one hundred thirty-one million, nine hundred ninety-five thousand, nine hundred one".