133531423 has 2 divisors, whose sum is σ = 133531424. Its totient is φ = 133531422.

The previous prime is 133531397. The next prime is 133531427. The reversal of 133531423 is 324135331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133531423 - 2⁹ = 133530911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133531427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66765711 + 66765712.

It is an arithmetic number, because the mean of its divisors is an integer number (66765712).

Almost surely, 2^133531423 is an apocalyptic number.

133531423 is a deficient number, since it is larger than the sum of its proper divisors (1).

133531423 is an equidigital number, since it uses as much as digits as its factorization.

133531423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 25.

The square root of 133531423 is about 11555.5797344833. The cubic root of 133531423 is about 511.1258263757.

Adding to 133531423 its reverse (324135331), we get a palindrome (457666754).

The spelling of 133531423 in words is "one hundred thirty-three million, five hundred thirty-one thousand, four hundred twenty-three".