133688431 has 2 divisors, whose sum is σ = 133688432. Its totient is φ = 133688430.

The previous prime is 133688381. The next prime is 133688449. The reversal of 133688431 is 134886331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133688431 - 2¹¹ = 133686383 is a prime.

It is a super-2 number, since 2×133688431² = 35745193166483522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133688491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66844215 + 66844216.

It is an arithmetic number, because the mean of its divisors is an integer number (66844216).

Almost surely, 2^133688431 is an apocalyptic number.

133688431 is a deficient number, since it is larger than the sum of its proper divisors (1).

133688431 is an equidigital number, since it uses as much as digits as its factorization.

133688431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 133688431 is about 11562.3713398247. The cubic root of 133688431 is about 511.3260773956.

The spelling of 133688431 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, four hundred thirty-one".