133632531 has 8 divisors (see below), whose sum is σ = 197974160. Its totient is φ = 89088336.

The previous prime is 133632523. The next prime is 133632607. The reversal of 133632531 is 135236331.

It is a happy number.

133632531 is a `hidden beast` number, since 1 + 336 + 325 + 3 + 1 = 666.

It is not a de Polignac number, because 133632531 - 2³ = 133632523 is a prime.

It is a super-2 number, since 2×133632531² = 35715306682931922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4949353 = 133632531 / (1 + 3 + 3 + 6 + 3 + 2 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133632495 and 133632504.

It is not an unprimeable number, because it can be changed into a prime (133632431) 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, 2474650 + ... + 2474703.

It is an arithmetic number, because the mean of its divisors is an integer number (24746770).

Almost surely, 2^133632531 is an apocalyptic number.

133632531 is a deficient number, since it is larger than the sum of its proper divisors (64341629).

133632531 is an equidigital number, since it uses as much as digits as its factorization.

133632531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4949362 (or 4949356 counting only the distinct ones).

The product of its digits is 4860, while the sum is 27.

The square root of 133632531 is about 11559.9537628833. The cubic root of 133632531 is about 511.2547994440.

Adding to 133632531 its reverse (135236331), we get a palindrome (268868862).

The spelling of 133632531 in words is "one hundred thirty-three million, six hundred thirty-two thousand, five hundred thirty-one".