131313261 has 4 divisors (see below), whose sum is σ = 175084352. Its totient is φ = 87542172.

The previous prime is 131313257. The next prime is 131313263. The reversal of 131313261 is 162313131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131313261 - 2² = 131313257 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 (131313263) 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, 21885541 + ... + 21885546.

It is an arithmetic number, because the mean of its divisors is an integer number (43771088).

Almost surely, 2^131313261 is an apocalyptic number.

It is an amenable number.

131313261 is a deficient number, since it is larger than the sum of its proper divisors (43771091).

131313261 is an equidigital number, since it uses as much as digits as its factorization.

131313261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43771090.

The product of its digits is 324, while the sum is 21.

The square root of 131313261 is about 11459.1998411756. The cubic root of 131313261 is about 508.2798138644.

Adding to 131313261 its reverse (162313131), we get a palindrome (293626392).

The spelling of 131313261 in words is "one hundred thirty-one million, three hundred thirteen thousand, two hundred sixty-one".