133051531 has 4 divisors (see below), whose sum is σ = 133135632. Its totient is φ = 132967432.

The previous prime is 133051493. The next prime is 133051543. The reversal of 133051531 is 135150331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133051531 - 2⁹ = 133051019 is a prime.

It is a super-2 number, since 2×133051531² = 35405419802887922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133051561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39631 + ... + 42856.

It is an arithmetic number, because the mean of its divisors is an integer number (33283908).

Almost surely, 2^133051531 is an apocalyptic number.

133051531 is a deficient number, since it is larger than the sum of its proper divisors (84101).

133051531 is an equidigital number, since it uses as much as digits as its factorization.

133051531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84100.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 133051531 is about 11534.7965304985. The cubic root of 133051531 is about 510.5127880933.

The spelling of 133051531 in words is "one hundred thirty-three million, fifty-one thousand, five hundred thirty-one".