133261493 has 4 divisors (see below), whose sum is σ = 133333068. Its totient is φ = 133189920.

The previous prime is 133261489. The next prime is 133261501. The reversal of 133261493 is 394162331.

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 56821444 + 76440049 = 7538^2 + 8743^2 .

It is a cyclic number.

It is not a de Polignac number, because 133261493 - 2² = 133261489 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 (133261463) 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, 32918 + ... + 36743.

It is an arithmetic number, because the mean of its divisors is an integer number (33333267).

Almost surely, 2^133261493 is an apocalyptic number.

It is an amenable number.

133261493 is a deficient number, since it is larger than the sum of its proper divisors (71575).

133261493 is an equidigital number, since it uses as much as digits as its factorization.

133261493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71574.

The product of its digits is 11664, while the sum is 32.

The square root of 133261493 is about 11543.8941869717. The cubic root of 133261493 is about 510.7811852367.

The spelling of 133261493 in words is "one hundred thirty-three million, two hundred sixty-one thousand, four hundred ninety-three".