131313765 has 32 divisors (see below), whose sum is σ = 229718016. Its totient is φ = 63524160.

The previous prime is 131313761. The next prime is 131313779. The reversal of 131313765 is 567313131.

It is not a de Polignac number, because 131313765 - 2² = 131313761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131313761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135312 + ... + 136278.

It is an arithmetic number, because the mean of its divisors is an integer number (7178688).

Almost surely, 2^131313765 is an apocalyptic number.

131313765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131313765 is a deficient number, since it is larger than the sum of its proper divisors (98404251).

131313765 is a wasteful number, since it uses less digits than its factorization.

131313765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809.

The product of its digits is 5670, while the sum is 30.

The square root of 131313765 is about 11459.2218322188. The cubic root of 131313765 is about 508.2804641483.

Adding to 131313765 its reverse (567313131), we get a palindrome (698626896).

The spelling of 131313765 in words is "one hundred thirty-one million, three hundred thirteen thousand, seven hundred sixty-five".