133465681 has 8 divisors (see below), whose sum is σ = 137012480. Its totient is φ = 129965472.

The previous prime is 133465667. The next prime is 133465721. The reversal of 133465681 is 186564331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133465681 - 2⁹ = 133465169 is a prime.

It is a super-2 number, since 2×133465681² = 35626176009587522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133465681.

It is not an unprimeable number, because it can be changed into a prime (133465081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5805 + ... + 17338.

It is an arithmetic number, because the mean of its divisors is an integer number (17126560).

Almost surely, 2^133465681 is an apocalyptic number.

It is an amenable number.

133465681 is a deficient number, since it is larger than the sum of its proper divisors (3546799).

133465681 is an equidigital number, since it uses as much as digits as its factorization.

133465681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23295.

The product of its digits is 51840, while the sum is 37.

The square root of 133465681 is about 11552.7347844569. The cubic root of 133465681 is about 511.0419311412.

The spelling of 133465681 in words is "one hundred thirty-three million, four hundred sixty-five thousand, six hundred eighty-one".