61097689 has 2 divisors, whose sum is σ = 61097690. Its totient is φ = 61097688.

The previous prime is 61097669. The next prime is 61097723. The reversal of 61097689 is 98679016.

61097689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31449664 + 29648025 = 5608^2 + 5445^2 .

It is a cyclic number.

It is not a de Polignac number, because 61097689 - 2¹¹ = 61095641 is a prime.

It is a super-2 number, since 2×61097689² = 7465855202281442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61097639) 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 as a sum of consecutive naturals, namely, 30548844 + 30548845.

It is an arithmetic number, because the mean of its divisors is an integer number (30548845).

Almost surely, 2^61097689 is an apocalyptic number.

It is an amenable number.

61097689 is a deficient number, since it is larger than the sum of its proper divisors (1).

61097689 is an equidigital number, since it uses as much as digits as its factorization.

61097689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 61097689 is about 7816.5010714513. The cubic root of 61097689 is about 393.8597441977.

It can be divided in two parts, 610976 and 89, that added together give a triangular number (611065 = T₁₁₀₅).

The spelling of 61097689 in words is "sixty-one million, ninety-seven thousand, six hundred eighty-nine".