131718465 has 24 divisors (see below), whose sum is σ = 241743528. Its totient is φ = 66117120.

The previous prime is 131718463. The next prime is 131718467. The reversal of 131718465 is 564817131.

It is an interprime number because it is at equal distance from previous prime (131718463) and next prime (131718467).

It can be written as a sum of positive squares in 4 ways, for example, as 53714241 + 78004224 = 7329^2 + 8832^2 .

It is not a de Polignac number, because 131718465 - 2¹ = 131718463 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (131718463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85326 + ... + 86855.

It is an arithmetic number, because the mean of its divisors is an integer number (10072647).

Almost surely, 2^131718465 is an apocalyptic number.

131718465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131718465 is a deficient number, since it is larger than the sum of its proper divisors (110025063).

131718465 is a wasteful number, since it uses less digits than its factorization.

131718465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172209 (or 172206 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 131718465 is about 11476.8665148637. The cubic root of 131718465 is about 508.8020904633.

The spelling of 131718465 in words is "one hundred thirty-one million, seven hundred eighteen thousand, four hundred sixty-five".