133431173 has 2 divisors, whose sum is σ = 133431174. Its totient is φ = 133431172.

The previous prime is 133431149. The next prime is 133431187. The reversal of 133431173 is 371134331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96864964 + 36566209 = 9842^2 + 6047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133431173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133431143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66715586 + 66715587.

It is an arithmetic number, because the mean of its divisors is an integer number (66715587).

Almost surely, 2^133431173 is an apocalyptic number.

It is an amenable number.

133431173 is a deficient number, since it is larger than the sum of its proper divisors (1).

133431173 is an equidigital number, since it uses as much as digits as its factorization.

133431173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 26.

The square root of 133431173 is about 11551.2411887208. The cubic root of 133431173 is about 510.9978834756.

The spelling of 133431173 in words is "one hundred thirty-three million, four hundred thirty-one thousand, one hundred seventy-three".