133512531 has 8 divisors (see below), whose sum is σ = 178073040. Its totient is φ = 88980192.

The previous prime is 133512529. The next prime is 133512541. The reversal of 133512531 is 135215331.

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

It is not a de Polignac number, because 133512531 - 2¹ = 133512529 is a prime.

It is a super-2 number, since 2×133512531² = 35651191868051922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133512521) 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, 9721 + ... + 19013.

It is an arithmetic number, because the mean of its divisors is an integer number (22259130).

Almost surely, 2^133512531 is an apocalyptic number.

133512531 is a deficient number, since it is larger than the sum of its proper divisors (44560509).

133512531 is an equidigital number, since it uses as much as digits as its factorization.

133512531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14085.

The product of its digits is 1350, while the sum is 24.

The square root of 133512531 is about 11554.7622649711. The cubic root of 133512531 is about 511.1017205777.

Adding to 133512531 its reverse (135215331), we get a palindrome (268727862).

The spelling of 133512531 in words is "one hundred thirty-three million, five hundred twelve thousand, five hundred thirty-one".