68491159 has 4 divisors (see below), whose sum is σ = 74717640. Its totient is φ = 62264680.

The previous prime is 68491117. The next prime is 68491169. The reversal of 68491159 is 95119486.

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 68491159 - 2¹⁷ = 68360087 is a prime.

It is a super-2 number, since 2×68491159² = 9382077722326562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68491169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3113224 + ... + 3113245.

It is an arithmetic number, because the mean of its divisors is an integer number (18679410).

Almost surely, 2^68491159 is an apocalyptic number.

68491159 is a deficient number, since it is larger than the sum of its proper divisors (6226481).

68491159 is a wasteful number, since it uses less digits than its factorization.

68491159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226480.

The product of its digits is 77760, while the sum is 43.

The square root of 68491159 is about 8275.9385570460. The cubic root of 68491159 is about 409.1458701002.

It can be divided in two parts, 6849 and 1159, that added together give a palindrome (8008).

The spelling of 68491159 in words is "sixty-eight million, four hundred ninety-one thousand, one hundred fifty-nine".