133239497 has 8 divisors (see below), whose sum is σ = 135150120. Its totient is φ = 131338240.

The previous prime is 133239481. The next prime is 133239511. The reversal of 133239497 is 794932331.

It can be written as a sum of positive squares in 4 ways, for example, as 31854736 + 101384761 = 5644^2 + 10069^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133239497 - 2⁴ = 133239481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133239467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29297 + ... + 33537.

It is an arithmetic number, because the mean of its divisors is an integer number (16893765).

Almost surely, 2^133239497 is an apocalyptic number.

It is an amenable number.

133239497 is a deficient number, since it is larger than the sum of its proper divisors (1910623).

133239497 is an equidigital number, since it uses as much as digits as its factorization.

133239497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683.

The product of its digits is 122472, while the sum is 41.

The square root of 133239497 is about 11542.9414362198. The cubic root of 133239497 is about 510.7530806910.

The spelling of 133239497 in words is "one hundred thirty-three million, two hundred thirty-nine thousand, four hundred ninety-seven".