131631173 has 2 divisors, whose sum is σ = 131631174. Its totient is φ = 131631172.

The previous prime is 131631133. The next prime is 131631217. The reversal of 131631173 is 371136131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131629729 + 1444 = 11473^2 + 38^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131631173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131631133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65815586 + 65815587.

It is an arithmetic number, because the mean of its divisors is an integer number (65815587).

Almost surely, 2^131631173 is an apocalyptic number.

It is an amenable number.

131631173 is a deficient number, since it is larger than the sum of its proper divisors (1).

131631173 is an equidigital number, since it uses as much as digits as its factorization.

131631173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

The square root of 131631173 is about 11473.0629301856. The cubic root of 131631173 is about 508.6896684449.

The spelling of 131631173 in words is "one hundred thirty-one million, six hundred thirty-one thousand, one hundred seventy-three".