133366261 has 4 divisors (see below), whose sum is σ = 152418592. Its totient is φ = 114313932.

The previous prime is 133366249. The next prime is 133366283. The reversal of 133366261 is 162663331.

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 not a de Polignac number, because 133366261 - 2⁷ = 133366133 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 (133366201) 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, 9526155 + ... + 9526168.

It is an arithmetic number, because the mean of its divisors is an integer number (38104648).

Almost surely, 2^133366261 is an apocalyptic number.

It is an amenable number.

133366261 is a deficient number, since it is larger than the sum of its proper divisors (19052331).

133366261 is an equidigital number, since it uses as much as digits as its factorization.

133366261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19052330.

The product of its digits is 11664, while the sum is 31.

The square root of 133366261 is about 11548.4311055658. The cubic root of 133366261 is about 510.9150061035.

The spelling of 133366261 in words is "one hundred thirty-three million, three hundred sixty-six thousand, two hundred sixty-one".