131240279 has 4 divisors (see below), whose sum is σ = 131803776. Its totient is φ = 130676784.

The previous prime is 131240209. The next prime is 131240281. The reversal of 131240279 is 972042131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131240279 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 (131240209) 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, 281399 + ... + 281864.

It is an arithmetic number, because the mean of its divisors is an integer number (32950944).

Almost surely, 2^131240279 is an apocalyptic number.

131240279 is a deficient number, since it is larger than the sum of its proper divisors (563497).

131240279 is an equidigital number, since it uses as much as digits as its factorization.

131240279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563496.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 131240279 is about 11456.0149703114. The cubic root of 131240279 is about 508.1856315720.

The spelling of 131240279 in words is "one hundred thirty-one million, two hundred forty thousand, two hundred seventy-nine".