133791265 has 4 divisors (see below), whose sum is σ = 160549524. Its totient is φ = 107033008.

The previous prime is 133791199. The next prime is 133791271. The reversal of 133791265 is 562197331.

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 89794576 + 43996689 = 9476^2 + 6633^2 .

It is a cyclic number.

It is not a de Polignac number, because 133791265 - 2⁷ = 133791137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13379122 + ... + 13379131.

It is an arithmetic number, because the mean of its divisors is an integer number (40137381).

Almost surely, 2^133791265 is an apocalyptic number.

It is an amenable number.

133791265 is a deficient number, since it is larger than the sum of its proper divisors (26758259).

133791265 is an equidigital number, since it uses as much as digits as its factorization.

133791265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26758258.

The product of its digits is 34020, while the sum is 37.

The square root of 133791265 is about 11566.8174101608. The cubic root of 133791265 is about 511.4571488956.

The spelling of 133791265 in words is "one hundred thirty-three million, seven hundred ninety-one thousand, two hundred sixty-five".