131218265 has 8 divisors (see below), whose sum is σ = 157656840. Its totient is φ = 104844672.

The previous prime is 131218261. The next prime is 131218267. The reversal of 131218265 is 562812131.

It can be written as a sum of positive squares in 4 ways, for example, as 15784729 + 115433536 = 3973^2 + 10744^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131218265 - 2² = 131218261 is a prime.

It is a super-2 number, since 2×131218265² = 34436466139220450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131218261) 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, 11684 + ... + 19973.

It is an arithmetic number, because the mean of its divisors is an integer number (19707105).

Almost surely, 2^131218265 is an apocalyptic number.

It is an amenable number.

131218265 is a deficient number, since it is larger than the sum of its proper divisors (26438575).

131218265 is an equidigital number, since it uses as much as digits as its factorization.

131218265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32491.

The product of its digits is 2880, while the sum is 29.

The square root of 131218265 is about 11455.0541247084. The cubic root of 131218265 is about 508.1572159460.

The spelling of 131218265 in words is "one hundred thirty-one million, two hundred eighteen thousand, two hundred sixty-five".