68171923 has 2 divisors, whose sum is σ = 68171924. Its totient is φ = 68171922.

The previous prime is 68171903. The next prime is 68171927. The reversal of 68171923 is 32917186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68171923 is a prime.

It is a super-2 number, since 2×68171923² = 9294822171035858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68171927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34085961 + 34085962.

It is an arithmetic number, because the mean of its divisors is an integer number (34085962).

Almost surely, 2^68171923 is an apocalyptic number.

68171923 is a deficient number, since it is larger than the sum of its proper divisors (1).

68171923 is an equidigital number, since it uses as much as digits as its factorization.

68171923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 68171923 is about 8256.6290336917. The cubic root of 68171923 is about 408.5092061864.

It can be divided in two parts, 68 and 171923, that added together give a triangular number (171991 = T₅₈₆).

The spelling of 68171923 in words is "sixty-eight million, one hundred seventy-one thousand, nine hundred twenty-three".