133261273 has 4 divisors (see below), whose sum is σ = 133959168. Its totient is φ = 132563380.

The previous prime is 133261267. The next prime is 133261277. The reversal of 133261273 is 372162331.

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, and also an emirpimes, since its reverse is a distinct semiprime: 372162331 = 653 ⋅569927.

It is a cyclic number.

It is not a de Polignac number, because 133261273 - 2¹⁷ = 133130201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133261277) 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, 348661 + ... + 349042.

It is an arithmetic number, because the mean of its divisors is an integer number (33489792).

Almost surely, 2^133261273 is an apocalyptic number.

It is an amenable number.

133261273 is a deficient number, since it is larger than the sum of its proper divisors (697895).

133261273 is an equidigital number, since it uses as much as digits as its factorization.

133261273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697894.

The product of its digits is 4536, while the sum is 28.

The square root of 133261273 is about 11543.8846581209. The cubic root of 133261273 is about 510.7809041555.

The spelling of 133261273 in words is "one hundred thirty-three million, two hundred sixty-one thousand, two hundred seventy-three".