61166213 has 2 divisors, whose sum is σ = 61166214. Its totient is φ = 61166212.

The previous prime is 61166201. The next prime is 61166297. The reversal of 61166213 is 31266116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37185604 + 23980609 = 6098^2 + 4897^2 .

It is a cyclic number.

It is not a de Polignac number, because 61166213 - 2⁴ = 61166197 is a prime.

It is a super-2 number, since 2×61166213² = 7482611225522738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61163213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30583106 + 30583107.

It is an arithmetic number, because the mean of its divisors is an integer number (30583107).

Almost surely, 2^61166213 is an apocalyptic number.

It is an amenable number.

61166213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61166213 is an equidigital number, since it uses as much as digits as its factorization.

61166213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 61166213 is about 7820.8831342758. The cubic root of 61166213 is about 394.0069334072.

The spelling of 61166213 in words is "sixty-one million, one hundred sixty-six thousand, two hundred thirteen".