133323131 has 4 divisors (see below), whose sum is σ = 134643264. Its totient is φ = 132003000.

The previous prime is 133323109. The next prime is 133323139. The reversal of 133323131 is 131323331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133323131 is a prime.

It is a super-2 number, since 2×133323131² = 35550114519286322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133323139) 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, 659915 + ... + 660116.

It is an arithmetic number, because the mean of its divisors is an integer number (33660816).

Almost surely, 2^133323131 is an apocalyptic number.

133323131 is a deficient number, since it is larger than the sum of its proper divisors (1320133).

133323131 is a wasteful number, since it uses less digits than its factorization.

133323131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320132.

The product of its digits is 486, while the sum is 20.

The square root of 133323131 is about 11546.5636013491. The cubic root of 133323131 is about 510.8599243562.

Adding to 133323131 its reverse (131323331), we get a palindrome (264646462).

The spelling of 133323131 in words is "one hundred thirty-three million, three hundred twenty-three thousand, one hundred thirty-one".