133499915 has 4 divisors (see below), whose sum is σ = 160199904. Its totient is φ = 106799928.

The previous prime is 133499893. The next prime is 133499917. The reversal of 133499915 is 519994331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133499915 - 2⁶ = 133499851 is a prime.

It is a super-4 number, since 4×133499915⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133499917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13349987 + ... + 13349996.

It is an arithmetic number, because the mean of its divisors is an integer number (40049976).

Almost surely, 2^133499915 is an apocalyptic number.

133499915 is a deficient number, since it is larger than the sum of its proper divisors (26699989).

133499915 is an equidigital number, since it uses as much as digits as its factorization.

133499915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26699988.

The product of its digits is 131220, while the sum is 44.

The square root of 133499915 is about 11554.2163299810. The cubic root of 133499915 is about 511.0856215584.

The spelling of 133499915 in words is "one hundred thirty-three million, four hundred ninety-nine thousand, nine hundred fifteen".