68411891 has 4 divisors (see below), whose sum is σ = 69433032. Its totient is φ = 67390752.

The previous prime is 68411887. The next prime is 68411911. The reversal of 68411891 is 19811486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68411891 - 2² = 68411887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68411801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510470 + ... + 510603.

It is an arithmetic number, because the mean of its divisors is an integer number (17358258).

Almost surely, 2^68411891 is an apocalyptic number.

68411891 is a deficient number, since it is larger than the sum of its proper divisors (1021141).

68411891 is a wasteful number, since it uses less digits than its factorization.

68411891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021140.

The product of its digits is 13824, while the sum is 38.

The square root of 68411891 is about 8271.1481065206. The cubic root of 68411891 is about 408.9879679947.

The spelling of 68411891 in words is "sixty-eight million, four hundred eleven thousand, eight hundred ninety-one".