133172917 has 4 divisors (see below), whose sum is σ = 141006636. Its totient is φ = 125339200.

The previous prime is 133172909. The next prime is 133172927. The reversal of 133172917 is 719271331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114041041 + 19131876 = 10679^2 + 4374^2 .

It is a cyclic number.

It is not a de Polignac number, because 133172917 - 2³ = 133172909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133172927) 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, 3916834 + ... + 3916867.

It is an arithmetic number, because the mean of its divisors is an integer number (35251659).

Almost surely, 2^133172917 is an apocalyptic number.

133172917 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

133172917 is a deficient number, since it is larger than the sum of its proper divisors (7833719).

133172917 is an equidigital number, since it uses as much as digits as its factorization.

133172917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833718.

The product of its digits is 7938, while the sum is 34.

The square root of 133172917 is about 11540.0570622506. The cubic root of 133172917 is about 510.6679917929.

The spelling of 133172917 in words is "one hundred thirty-three million, one hundred seventy-two thousand, nine hundred seventeen".