231172133 has 4 divisors (see below), whose sum is σ = 233461068. Its totient is φ = 228883200.

The previous prime is 231172121. The next prime is 231172147. The reversal of 231172133 is 331271132.

231172133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160326244 + 70845889 = 12662^2 + 8417^2 .

It is a cyclic number.

It is not a de Polignac number, because 231172133 - 2²⁶ = 164063269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231172099 and 231172108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231172433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1144316 + ... + 1144517.

It is an arithmetic number, because the mean of its divisors is an integer number (58365267).

Almost surely, 2^231172133 is an apocalyptic number.

It is an amenable number.

231172133 is a deficient number, since it is larger than the sum of its proper divisors (2288935).

231172133 is a wasteful number, since it uses less digits than its factorization.

231172133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288934.

The product of its digits is 756, while the sum is 23.

The square root of 231172133 is about 15204.3458589970. The cubic root of 231172133 is about 613.7316119500.

The spelling of 231172133 in words is "two hundred thirty-one million, one hundred seventy-two thousand, one hundred thirty-three".