68113561 has 2 divisors, whose sum is σ = 68113562. Its totient is φ = 68113560.

The previous prime is 68113519. The next prime is 68113567. The reversal of 68113561 is 16531186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 14017536 = 7355^2 + 3744^2 .

It is a cyclic number.

It is not a de Polignac number, because 68113561 - 2⁷ = 68113433 is a prime.

It is equal to p_4013599 and since 68113561 and 4013599 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (68113567) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34056780 + 34056781.

It is an arithmetic number, because the mean of its divisors is an integer number (34056781).

Almost surely, 2^68113561 is an apocalyptic number.

It is an amenable number.

68113561 is a deficient number, since it is larger than the sum of its proper divisors (1).

68113561 is an equidigital number, since it uses as much as digits as its factorization.

68113561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 68113561 is about 8253.0940258790. The cubic root of 68113561 is about 408.3925979601.

The spelling of 68113561 in words is "sixty-eight million, one hundred thirteen thousand, five hundred sixty-one".