133691900 has 18 divisors (see below), whose sum is σ = 290111640. Its totient is φ = 53476720.

The previous prime is 133691891. The next prime is 133691911. The reversal of 133691900 is 9196331.

It is a super-2 number, since 2×133691900² = 35747048251220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 668360 + ... + 668559.

Almost surely, 2^133691900 is an apocalyptic number.

133691900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133691900 is an abundant number, since it is smaller than the sum of its proper divisors (156419740).

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

133691900 is a wasteful number, since it uses less digits than its factorization.

133691900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336933 (or 1336926 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 133691900 is about 11562.5213513316. The cubic root of 133691900 is about 511.3305000541.

The spelling of 133691900 in words is "one hundred thirty-three million, six hundred ninety-one thousand, nine hundred".