133307531 has 4 divisors (see below), whose sum is σ = 152351472. Its totient is φ = 114263592.

The previous prime is 133307501. The next prime is 133307543. The reversal of 133307531 is 135703331.

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 133307531 - 2⁶ = 133307467 is a prime.

It is a super-2 number, since 2×133307531² = 35541795642631922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133307531.

It is not an unprimeable number, because it can be changed into a prime (133307501) 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, 9521960 + ... + 9521973.

It is an arithmetic number, because the mean of its divisors is an integer number (38087868).

Almost surely, 2^133307531 is an apocalyptic number.

133307531 is a deficient number, since it is larger than the sum of its proper divisors (19043941).

133307531 is an equidigital number, since it uses as much as digits as its factorization.

133307531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19043940.

The product of its (nonzero) digits is 2835, while the sum is 26.

The square root of 133307531 is about 11545.8880559271. Note that the first 3 decimals coincide. The cubic root of 133307531 is about 510.8399985174.

The spelling of 133307531 in words is "one hundred thirty-three million, three hundred seven thousand, five hundred thirty-one".