68941991 has 8 divisors (see below), whose sum is σ = 69588480. Its totient is φ = 68298552.

The previous prime is 68941979. The next prime is 68941993. The reversal of 68941991 is 19914986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68941991 - 2⁶ = 68941927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68941993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77636 + ... + 78518.

It is an arithmetic number, because the mean of its divisors is an integer number (8698560).

Almost surely, 2^68941991 is an apocalyptic number.

68941991 is a deficient number, since it is larger than the sum of its proper divisors (646489).

68941991 is a wasteful number, since it uses less digits than its factorization.

68941991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525.

The product of its digits is 139968, while the sum is 47.

The square root of 68941991 is about 8303.1313972501. The cubic root of 68941991 is about 410.0416198083.

The spelling of 68941991 in words is "sixty-eight million, nine hundred forty-one thousand, nine hundred ninety-one".