133320231 has 12 divisors (see below), whose sum is σ = 210080520. Its totient is φ = 80800080.

The previous prime is 133320227. The next prime is 133320241. The reversal of 133320231 is 132023331.

It is not a de Polignac number, because 133320231 - 2² = 133320227 is a prime.

It is a super-2 number, since 2×133320231² = 35548567987786722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133320211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 673236 + ... + 673433.

It is an arithmetic number, because the mean of its divisors is an integer number (17506710).

Almost surely, 2^133320231 is an apocalyptic number.

133320231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133320231 is a deficient number, since it is larger than the sum of its proper divisors (76760289).

133320231 is a wasteful number, since it uses less digits than its factorization.

133320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346686 (or 1346683 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 133320231 is about 11546.4380221781. The cubic root of 133320231 is about 510.8562203115.

Adding to 133320231 its reverse (132023331), we get a palindrome (265343562).

The spelling of 133320231 in words is "one hundred thirty-three million, three hundred twenty thousand, two hundred thirty-one".