133787917 has 4 divisors (see below), whose sum is σ = 134750560. Its totient is φ = 132825276.

The previous prime is 133787887. The next prime is 133787939. The reversal of 133787917 is 719787331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133787917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133787117) 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, 481113 + ... + 481390.

It is an arithmetic number, because the mean of its divisors is an integer number (33687640).

Almost surely, 2^133787917 is an apocalyptic number.

It is an amenable number.

133787917 is a deficient number, since it is larger than the sum of its proper divisors (962643).

133787917 is an equidigital number, since it uses as much as digits as its factorization.

133787917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962642.

The product of its digits is 222264, while the sum is 46.

The square root of 133787917 is about 11566.6726849168. The cubic root of 133787917 is about 511.4528826160.

The spelling of 133787917 in words is "one hundred thirty-three million, seven hundred eighty-seven thousand, nine hundred seventeen".