68989561 has 4 divisors (see below), whose sum is σ = 70457472. Its totient is φ = 67521652.

The previous prime is 68989549. The next prime is 68989567. The reversal of 68989561 is 16598986.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16598986 = 2 ⋅8299493.

It is a cyclic number.

It is not a de Polignac number, because 68989561 - 2⁷ = 68989433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68989499 and 68989508.

It is not an unprimeable number, because it can be changed into a prime (68989567) 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, 733885 + ... + 733978.

It is an arithmetic number, because the mean of its divisors is an integer number (17614368).

Almost surely, 2^68989561 is an apocalyptic number.

It is an amenable number.

68989561 is a deficient number, since it is larger than the sum of its proper divisors (1467911).

68989561 is a wasteful number, since it uses less digits than its factorization.

68989561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467910.

The product of its digits is 933120, while the sum is 52.

The square root of 68989561 is about 8305.9954851902. The cubic root of 68989561 is about 410.1359077499.

The spelling of 68989561 in words is "sixty-eight million, nine hundred eighty-nine thousand, five hundred sixty-one".