68431031 has 2 divisors, whose sum is σ = 68431032. Its totient is φ = 68431030.

The previous prime is 68430991. The next prime is 68431057. The reversal of 68431031 is 13013486.

It is an a-pointer prime, because the next prime (68431057) can be obtained adding 68431031 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68431031 is a prime.

It is a super-2 number, since 2×68431031² = 9365612007445922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68431931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34215515 + 34215516.

It is an arithmetic number, because the mean of its divisors is an integer number (34215516).

Almost surely, 2^68431031 is an apocalyptic number.

68431031 is a deficient number, since it is larger than the sum of its proper divisors (1).

68431031 is an equidigital number, since it uses as much as digits as its factorization.

68431031 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 26.

The square root of 68431031 is about 8272.3050596554. The cubic root of 68431031 is about 409.0261061004.

The spelling of 68431031 in words is "sixty-eight million, four hundred thirty-one thousand, thirty-one".