133217899 has 4 divisors (see below), whose sum is σ = 141054264. Its totient is φ = 125381536.

The previous prime is 133217879. The next prime is 133217921. The reversal of 133217899 is 998712331.

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 133217899 - 2¹³ = 133209707 is a prime.

It is a super-2 number, since 2×133217899² = 35494017227948402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133217809) 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, 3918157 + ... + 3918190.

It is an arithmetic number, because the mean of its divisors is an integer number (35263566).

Almost surely, 2^133217899 is an apocalyptic number.

133217899 is a deficient number, since it is larger than the sum of its proper divisors (7836365).

133217899 is an equidigital number, since it uses as much as digits as its factorization.

133217899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7836364.

The product of its digits is 81648, while the sum is 43.

The square root of 133217899 is about 11542.0058482051. The cubic root of 133217899 is about 510.7254816647.

The spelling of 133217899 in words is "one hundred thirty-three million, two hundred seventeen thousand, eight hundred ninety-nine".