68438431 has 2 divisors, whose sum is σ = 68438432. Its totient is φ = 68438430.

The previous prime is 68438429. The next prime is 68438443. The reversal of 68438431 is 13483486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68438431 - 2¹ = 68438429 is a prime.

It is a super-2 number, since 2×68438431² = 9367637675483522, which contains 22 as substring.

Together with 68438429, 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 (68430431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34219215 + 34219216.

It is an arithmetic number, because the mean of its divisors is an integer number (34219216).

Almost surely, 2^68438431 is an apocalyptic number.

68438431 is a deficient number, since it is larger than the sum of its proper divisors (1).

68438431 is an equidigital number, since it uses as much as digits as its factorization.

68438431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 37.

The square root of 68438431 is about 8272.7523231389. The cubic root of 68438431 is about 409.0408493343.

The spelling of 68438431 in words is "sixty-eight million, four hundred thirty-eight thousand, four hundred thirty-one".