68191321 has 4 divisors (see below), whose sum is σ = 74390544. Its totient is φ = 61992100.

The previous prime is 68191309. The next prime is 68191349. The reversal of 68191321 is 12319186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68191321 - 2²¹ = 66094169 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68191121) 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, 3099595 + ... + 3099616.

It is an arithmetic number, because the mean of its divisors is an integer number (18597636).

Almost surely, 2^68191321 is an apocalyptic number.

It is an amenable number.

68191321 is a deficient number, since it is larger than the sum of its proper divisors (6199223).

68191321 is a wasteful number, since it uses less digits than its factorization.

68191321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6199222.

The product of its digits is 2592, while the sum is 31.

The square root of 68191321 is about 8257.8036426159. The cubic root of 68191321 is about 408.5479489696.

The spelling of 68191321 in words is "sixty-eight million, one hundred ninety-one thousand, three hundred twenty-one".