133889331 has 16 divisors (see below), whose sum is σ = 189256608. Its totient is φ = 83904000.

The previous prime is 133889299. The next prime is 133889339. The reversal of 133889331 is 133988331.

It is not a de Polignac number, because 133889331 - 2⁵ = 133889299 is a prime.

It is a super-2 number, since 2×133889331² = 35852705911255122, 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 133889331.

It is not an unprimeable number, because it can be changed into a prime (133889339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69481 + ... + 71381.

It is an arithmetic number, because the mean of its divisors is an integer number (11828538).

Almost surely, 2^133889331 is an apocalyptic number.

133889331 is a deficient number, since it is larger than the sum of its proper divisors (55367277).

133889331 is a wasteful number, since it uses less digits than its factorization.

133889331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302.

The product of its digits is 46656, while the sum is 39.

The square root of 133889331 is about 11571.0557426710. The cubic root of 133889331 is about 511.5820805873.

The spelling of 133889331 in words is "one hundred thirty-three million, eight hundred eighty-nine thousand, three hundred thirty-one".