133404431 has 2 divisors, whose sum is σ = 133404432. Its totient is φ = 133404430.

The previous prime is 133404409. The next prime is 133404449. The reversal of 133404431 is 134404331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133404431 - 2¹⁰ = 133403407 is a prime.

It is a super-2 number, since 2×133404431² = 35593484420867522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133404397 and 133404406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133404451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66702215 + 66702216.

It is an arithmetic number, because the mean of its divisors is an integer number (66702216).

Almost surely, 2^133404431 is an apocalyptic number.

133404431 is a deficient number, since it is larger than the sum of its proper divisors (1).

133404431 is an equidigital number, since it uses as much as digits as its factorization.

133404431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 133404431 is about 11550.0835927711. The cubic root of 133404431 is about 510.9637434815.

Adding to 133404431 its reverse (134404331), we get a palindrome (267808762).

It can be divided in two parts, 13340 and 4431, that added together give a palindrome (17771).

The spelling of 133404431 in words is "one hundred thirty-three million, four hundred four thousand, four hundred thirty-one".