133397331 has 4 divisors (see below), whose sum is σ = 177863112. Its totient is φ = 88931552.

The previous prime is 133397293. The next prime is 133397357. The reversal of 133397331 is 133793331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133397331 - 2¹⁵ = 133364563 is a prime.

It is a super-2 number, since 2×133397331² = 35589695835847122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133397292 and 133397301.

It is not an unprimeable number, because it can be changed into a prime (133397531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22232886 + ... + 22232891.

It is an arithmetic number, because the mean of its divisors is an integer number (44465778).

Almost surely, 2^133397331 is an apocalyptic number.

133397331 is a deficient number, since it is larger than the sum of its proper divisors (44465781).

133397331 is an equidigital number, since it uses as much as digits as its factorization.

133397331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44465780.

The product of its digits is 15309, while the sum is 33.

The square root of 133397331 is about 11549.7762315986. The cubic root of 133397331 is about 510.9546785478.

The spelling of 133397331 in words is "one hundred thirty-three million, three hundred ninety-seven thousand, three hundred thirty-one".