133791023 has 4 divisors (see below), whose sum is σ = 139608048. Its totient is φ = 127974000.

The previous prime is 133791019. The next prime is 133791029. The reversal of 133791023 is 320197331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320197331 = 41 ⋅7809691.

It is a cyclic number.

It is not a de Polignac number, because 133791023 - 2² = 133791019 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 (133791029) 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, 2908478 + ... + 2908523.

It is an arithmetic number, because the mean of its divisors is an integer number (34902012).

Almost surely, 2^133791023 is an apocalyptic number.

133791023 is a deficient number, since it is larger than the sum of its proper divisors (5817025).

133791023 is an equidigital number, since it uses as much as digits as its factorization.

133791023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817024.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 133791023 is about 11566.8069491973. The cubic root of 133791023 is about 511.4568405229.

The spelling of 133791023 in words is "one hundred thirty-three million, seven hundred ninety-one thousand, twenty-three".