133869861 has 16 divisors (see below), whose sum is σ = 201121920. Its totient is φ = 87988320.

The previous prime is 133869859. The next prime is 133869871. The reversal of 133869861 is 168968331.

It is a happy number.

It is not a de Polignac number, because 133869861 - 2¹ = 133869859 is a prime.

It is a super-2 number, since 2×133869861² = 35842279368318642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133869851) 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, 33000 + ... + 36833.

It is an arithmetic number, because the mean of its divisors is an integer number (12570120).

Almost surely, 2^133869861 is an apocalyptic number.

It is an amenable number.

133869861 is a deficient number, since it is larger than the sum of its proper divisors (67252059).

133869861 is an equidigital number, since it uses as much as digits as its factorization.

133869861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69913 (or 69907 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 133869861 is about 11570.2143886792. The cubic root of 133869861 is about 511.5572815340.

The spelling of 133869861 in words is "one hundred thirty-three million, eight hundred sixty-nine thousand, eight hundred sixty-one".