131235173 has 2 divisors, whose sum is σ = 131235174. Its totient is φ = 131235172.

The previous prime is 131235151. The next prime is 131235187. The reversal of 131235173 is 371532131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113912929 + 17322244 = 10673^2 + 4162^2 .

It is an emirp because it is prime and its reverse (371532131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131235173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131235133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65617586 + 65617587.

It is an arithmetic number, because the mean of its divisors is an integer number (65617587).

Almost surely, 2^131235173 is an apocalyptic number.

It is an amenable number.

131235173 is a deficient number, since it is larger than the sum of its proper divisors (1).

131235173 is an equidigital number, since it uses as much as digits as its factorization.

131235173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 26.

The square root of 131235173 is about 11455.7921157814. The cubic root of 131235173 is about 508.1790410407.

The spelling of 131235173 in words is "one hundred thirty-one million, two hundred thirty-five thousand, one hundred seventy-three".