133171431 has 8 divisors (see below), whose sum is σ = 177623424. Its totient is φ = 88750200.

The previous prime is 133171391. The next prime is 133171447. The reversal of 133171431 is 134171331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133171431 - 2²⁶ = 66062567 is a prime.

It is a super-2 number, since 2×133171431² = 35469260069175522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133171231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5790 + ... + 17316.

It is an arithmetic number, because the mean of its divisors is an integer number (22202928).

Almost surely, 2^133171431 is an apocalyptic number.

133171431 is a deficient number, since it is larger than the sum of its proper divisors (44451993).

133171431 is a wasteful number, since it uses less digits than its factorization.

133171431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15381.

The product of its digits is 756, while the sum is 24.

The square root of 133171431 is about 11539.9926776407. The cubic root of 133171431 is about 510.6660923690. Note that the first 3 decimals are identical.

The spelling of 133171431 in words is "one hundred thirty-three million, one hundred seventy-one thousand, four hundred thirty-one".