131516173 has 2 divisors, whose sum is σ = 131516174. Its totient is φ = 131516172.

The previous prime is 131516137. The next prime is 131516179. The reversal of 131516173 is 371615131.

Together with previous prime (131516137) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116251524 + 15264649 = 10782^2 + 3907^2 .

It is a cyclic number.

It is not a de Polignac number, because 131516173 - 2²¹ = 129419021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131516179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65758086 + 65758087.

It is an arithmetic number, because the mean of its divisors is an integer number (65758087).

Almost surely, 2^131516173 is an apocalyptic number.

It is an amenable number.

131516173 is a deficient number, since it is larger than the sum of its proper divisors (1).

131516173 is an equidigital number, since it uses as much as digits as its factorization.

131516173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 28.

The square root of 131516173 is about 11468.0500958097. The cubic root of 131516173 is about 508.5414858251.

The spelling of 131516173 in words is "one hundred thirty-one million, five hundred sixteen thousand, one hundred seventy-three".