133431121 has 2 divisors, whose sum is σ = 133431122. Its totient is φ = 133431120.

The previous prime is 133431101. The next prime is 133431127. The reversal of 133431121 is 121134331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90345025 + 43086096 = 9505^2 + 6564^2 .

It is a cyclic number.

It is not a de Polignac number, because 133431121 - 2⁷ = 133430993 is a prime.

It is not a weakly prime, because it can be changed into another prime (133431127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66715560 + 66715561.

It is an arithmetic number, because the mean of its divisors is an integer number (66715561).

Almost surely, 2^133431121 is an apocalyptic number.

It is an amenable number.

133431121 is a deficient number, since it is larger than the sum of its proper divisors (1).

133431121 is an equidigital number, since it uses as much as digits as its factorization.

133431121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 133431121 is about 11551.2389378802. The cubic root of 133431121 is about 510.9978170946.

Adding to 133431121 its reverse (121134331), we get a palindrome (254565452).

The spelling of 133431121 in words is "one hundred thirty-three million, four hundred thirty-one thousand, one hundred twenty-one".