133071531 has 8 divisors (see below), whose sum is σ = 177684624. Its totient is φ = 88586400.

The previous prime is 133071509. The next prime is 133071539. The reversal of 133071531 is 135170331.

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

It is not a de Polignac number, because 133071531 - 2⁷ = 133071403 is a prime.

It is a super-2 number, since 2×133071531² = 35416064725367922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133071539) 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, 29536 + ... + 33741.

It is an arithmetic number, because the mean of its divisors is an integer number (22210578).

Almost surely, 2^133071531 is an apocalyptic number.

133071531 is a deficient number, since it is larger than the sum of its proper divisors (44613093).

133071531 is an equidigital number, since it uses as much as digits as its factorization.

133071531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63981.

The product of its (nonzero) digits is 945, while the sum is 24.

The square root of 133071531 is about 11535.6634399587. The cubic root of 133071531 is about 510.5383665142.

The spelling of 133071531 in words is "one hundred thirty-three million, seventy-one thousand, five hundred thirty-one".