133403231 has 16 divisors (see below), whose sum is σ = 147323904. Its totient is φ = 120045024.

The previous prime is 133403201. The next prime is 133403251. The reversal of 133403231 is 132304331.

It is a cyclic number.

It is not a de Polignac number, because 133403231 - 2¹⁸ = 133141087 is a prime.

It is a super-2 number, since 2×133403231² = 35592844082478722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133403201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88970 + ... + 90456.

It is an arithmetic number, because the mean of its divisors is an integer number (9207744).

Almost surely, 2^133403231 is an apocalyptic number.

133403231 is a deficient number, since it is larger than the sum of its proper divisors (13920673).

133403231 is a wasteful number, since it uses less digits than its factorization.

133403231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 133403231 is about 11550.0316449783. The cubic root of 133403231 is about 510.9622114026.

Adding to 133403231 its reverse (132304331), we get a palindrome (265707562).

The spelling of 133403231 in words is "one hundred thirty-three million, four hundred three thousand, two hundred thirty-one".