133445531 has 8 divisors (see below), whose sum is σ = 140579280. Its totient is φ = 126322848.

The previous prime is 133445509. The next prime is 133445567. The reversal of 133445531 is 135544331.

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

It is a cyclic number.

It is not a de Polignac number, because 133445531 - 2¹⁴ = 133429147 is a prime.

It is a super-2 number, since 2×133445531² = 35615419487743922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133445494 and 133445503.

It is not an unprimeable number, because it can be changed into a prime (133445591) 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, 36185 + ... + 39701.

It is an arithmetic number, because the mean of its divisors is an integer number (17572410).

Almost surely, 2^133445531 is an apocalyptic number.

133445531 is a deficient number, since it is larger than the sum of its proper divisors (7133749).

133445531 is a wasteful number, since it uses less digits than its factorization.

133445531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533.

The product of its digits is 10800, while the sum is 29.

The square root of 133445531 is about 11551.8626636573. The cubic root of 133445531 is about 511.0162116376.

Adding to 133445531 its reverse (135544331), we get a palindrome (268989862).

The spelling of 133445531 in words is "one hundred thirty-three million, four hundred forty-five thousand, five hundred thirty-one".