133697172 has 48 divisors (see below), whose sum is σ = 368033792. Its totient is φ = 36966240.

The previous prime is 133697171. The next prime is 133697209. The reversal of 133697172 is 271796331.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 133697172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133697171) 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, 23068 + ... + 28275.

Almost surely, 2^133697172 is an apocalyptic number.

133697172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

133697172 is an abundant number, since it is smaller than the sum of its proper divisors (234336620).

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

133697172 is a wasteful number, since it uses less digits than its factorization.

133697172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51388 (or 51386 counting only the distinct ones).

The product of its digits is 47628, while the sum is 39.

The square root of 133697172 is about 11562.7493270416. The cubic root of 133697172 is about 511.3372212266.

The spelling of 133697172 in words is "one hundred thirty-three million, six hundred ninety-seven thousand, one hundred seventy-two".