133431939 has 12 divisors (see below), whose sum is σ = 194723256. Its totient is φ = 88036992.

The previous prime is 133431923. The next prime is 133431941. The reversal of 133431939 is 939134331.

133431939 is a `hidden beast` number, since 1 + 334 + 319 + 3 + 9 = 666.

It is not a de Polignac number, because 133431939 - 2⁴ = 133431923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133431979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75549 + ... + 77294.

It is an arithmetic number, because the mean of its divisors is an integer number (16226938).

Almost surely, 2^133431939 is an apocalyptic number.

133431939 is a deficient number, since it is larger than the sum of its proper divisors (61291317).

133431939 is a wasteful number, since it uses less digits than its factorization.

133431939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152946 (or 152943 counting only the distinct ones).

The product of its digits is 26244, while the sum is 36.

The square root of 133431939 is about 11551.2743452833. The cubic root of 133431939 is about 510.9988613172.

The spelling of 133431939 in words is "one hundred thirty-three million, four hundred thirty-one thousand, nine hundred thirty-nine".