133431243 has 32 divisors (see below), whose sum is σ = 205900800. Its totient is φ = 76010400.

The previous prime is 133431239. The next prime is 133431271. The reversal of 133431243 is 342134331.

It is not a de Polignac number, because 133431243 - 2² = 133431239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133431293) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86388 + ... + 87918.

It is an arithmetic number, because the mean of its divisors is an integer number (6434400).

Almost surely, 2^133431243 is an apocalyptic number.

133431243 is a deficient number, since it is larger than the sum of its proper divisors (72469557).

133431243 is a wasteful number, since it uses less digits than its factorization.

133431243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703.

The product of its digits is 2592, while the sum is 24.

The square root of 133431243 is about 11551.2442186978. The cubic root of 133431243 is about 510.9979728347.

Adding to 133431243 its reverse (342134331), we get a palindrome (475565574).

The spelling of 133431243 in words is "one hundred thirty-three million, four hundred thirty-one thousand, two hundred forty-three".