61366861 has 2 divisors, whose sum is σ = 61366862. Its totient is φ = 61366860.

The previous prime is 61366849. The next prime is 61366897. The reversal of 61366861 is 16866316.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57851236 + 3515625 = 7606^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 61366861 - 2¹⁵ = 61334093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61366861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61366801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30683430 + 30683431.

It is an arithmetic number, because the mean of its divisors is an integer number (30683431).

Almost surely, 2^61366861 is an apocalyptic number.

It is an amenable number.

61366861 is a deficient number, since it is larger than the sum of its proper divisors (1).

61366861 is an equidigital number, since it uses as much as digits as its factorization.

61366861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 61366861 is about 7833.7003389203. The cubic root of 61366861 is about 394.4372930852.

The spelling of 61366861 in words is "sixty-one million, three hundred sixty-six thousand, eight hundred sixty-one".