131909397 has 8 divisors (see below), whose sum is σ = 175933344. Its totient is φ = 87912528.

The previous prime is 131909369. The next prime is 131909431. The reversal of 131909397 is 793909131.

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

It is not a de Polignac number, because 131909397 - 2⁷ = 131909269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131909357) 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, 12178 + ... + 20300.

It is an arithmetic number, because the mean of its divisors is an integer number (21991668).

Almost surely, 2^131909397 is an apocalyptic number.

It is an amenable number.

131909397 is a deficient number, since it is larger than the sum of its proper divisors (44023947).

131909397 is an equidigital number, since it uses as much as digits as its factorization.

131909397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13539.

The product of its (nonzero) digits is 45927, while the sum is 42.

The square root of 131909397 is about 11485.1816267746. The cubic root of 131909397 is about 509.0478158165.

The spelling of 131909397 in words is "one hundred thirty-one million, nine hundred nine thousand, three hundred ninety-seven".