68191901 has 2 divisors, whose sum is σ = 68191902. Its totient is φ = 68191900.

The previous prime is 68191891. The next prime is 68191951. The reversal of 68191901 is 10919186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61936900 + 6255001 = 7870^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 68191901 - 2²⁶ = 1083037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68191951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34095950 + 34095951.

It is an arithmetic number, because the mean of its divisors is an integer number (34095951).

Almost surely, 2^68191901 is an apocalyptic number.

It is an amenable number.

68191901 is a deficient number, since it is larger than the sum of its proper divisors (1).

68191901 is an equidigital number, since it uses as much as digits as its factorization.

68191901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 68191901 is about 8257.8387608381. The cubic root of 68191901 is about 408.5491072653.

The spelling of 68191901 in words is "sixty-eight million, one hundred ninety-one thousand, nine hundred one".