133868431 has 2 divisors, whose sum is σ = 133868432. Its totient is φ = 133868430.

The previous prime is 133868429. The next prime is 133868443. The reversal of 133868431 is 134868331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133868431 - 2¹ = 133868429 is a prime.

It is a super-2 number, since 2×133868431² = 35841513636803522, which contains 22 as substring.

Together with 133868429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133868401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66934215 + 66934216.

It is an arithmetic number, because the mean of its divisors is an integer number (66934216).

Almost surely, 2^133868431 is an apocalyptic number.

133868431 is a deficient number, since it is larger than the sum of its proper divisors (1).

133868431 is an equidigital number, since it uses as much as digits as its factorization.

133868431 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 133868431 is about 11570.1525919065. The cubic root of 133868431 is about 511.5554600398. Note that the first 3 decimals are identical.

The spelling of 133868431 in words is "one hundred thirty-three million, eight hundred sixty-eight thousand, four hundred thirty-one".