131606465 has 4 divisors (see below), whose sum is σ = 157927764. Its totient is φ = 105285168.

The previous prime is 131606459. The next prime is 131606471. The reversal of 131606465 is 564606131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564606131 = 31 ⋅18213101.

It is an interprime number because it is at equal distance from previous prime (131606459) and next prime (131606471).

It can be written as a sum of positive squares in 2 ways, for example, as 61984129 + 69622336 = 7873^2 + 8344^2 .

It is a cyclic number.

It is not a de Polignac number, because 131606465 - 2¹² = 131602369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13160642 + ... + 13160651.

It is an arithmetic number, because the mean of its divisors is an integer number (39481941).

Almost surely, 2^131606465 is an apocalyptic number.

It is an amenable number.

131606465 is a deficient number, since it is larger than the sum of its proper divisors (26321299).

131606465 is an equidigital number, since it uses as much as digits as its factorization.

131606465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26321298.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 131606465 is about 11471.9860965746. The cubic root of 131606465 is about 508.6578383687.

The spelling of 131606465 in words is "one hundred thirty-one million, six hundred six thousand, four hundred sixty-five".