68191951 has 2 divisors, whose sum is σ = 68191952. Its totient is φ = 68191950.

The previous prime is 68191901. The next prime is 68191993. The reversal of 68191951 is 15919186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68191951 - 2¹⁷ = 68060879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68191901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34095975 + 34095976.

It is an arithmetic number, because the mean of its divisors is an integer number (34095976).

Almost surely, 2^68191951 is an apocalyptic number.

68191951 is a deficient number, since it is larger than the sum of its proper divisors (1).

68191951 is an equidigital number, since it uses as much as digits as its factorization.

68191951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 68191951 is about 8257.8417882640. The cubic root of 68191951 is about 408.5492071181.

The spelling of 68191951 in words is "sixty-eight million, one hundred ninety-one thousand, nine hundred fifty-one".