133194681 has 9 divisors (see below), whose sum is σ = 192442341. Its totient is φ = 88773372.

The previous prime is 133194667. The next prime is 133194689. The reversal of 133194681 is 186491331.

The square root of 133194681 is 11541.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 133194681 - 2⁹ = 133194169 is a prime.

It is a super-2 number, since 2×133194681² = 35481646093383522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133194689) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 32700 + ... + 36546.

Almost surely, 2^133194681 is an apocalyptic number.

133194681 is the 11541-st square number.

133194681 is the 5771-st centered octagonal number.

It is an amenable number.

133194681 is a deficient number, since it is larger than the sum of its proper divisors (59247660).

133194681 is an frugal number, since it uses more digits than its factorization.

133194681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700 (or 3850 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The cubic root of 133194681 is about 510.6958091926.

Multiplying 133194681 by its sum of digits (36), we get a square (4795008516 = 69246²).

The spelling of 133194681 in words is "one hundred thirty-three million, one hundred ninety-four thousand, six hundred eighty-one".