133451988 has 48 divisors (see below), whose sum is σ = 320323584. Its totient is φ = 43221600.

The previous prime is 133451977. The next prime is 133452001. The reversal of 133451988 is 889154331.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84381 + ... + 85947.

It is an arithmetic number, because the mean of its divisors is an integer number (6673408).

Almost surely, 2^133451988 is an apocalyptic number.

It is an amenable number.

133451988 is an abundant number, since it is smaller than the sum of its proper divisors (186871596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133451988 is a wasteful number, since it uses less digits than its factorization.

133451988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772 (or 1770 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 133451988 is about 11552.1421390147. The cubic root of 133451988 is about 511.0244536483.

The spelling of 133451988 in words is "one hundred thirty-three million, four hundred fifty-one thousand, nine hundred eighty-eight".