61220069 has 2 divisors, whose sum is σ = 61220070. Its totient is φ = 61220068.

The previous prime is 61220059. The next prime is 61220083. The reversal of 61220069 is 96002216.

61220069 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., 53728900 + 7491169 = 7330^2 + 2737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61220069 is a prime.

It is a super-2 number, since 2×61220069² = 7495793696729522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61220059) 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, 30610034 + 30610035.

It is an arithmetic number, because the mean of its divisors is an integer number (30610035).

Almost surely, 2^61220069 is an apocalyptic number.

It is an amenable number.

61220069 is a deficient number, since it is larger than the sum of its proper divisors (1).

61220069 is an equidigital number, since it uses as much as digits as its factorization.

61220069 is an odious number, because the sum of its binary digits is odd.

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

The square root of 61220069 is about 7824.3254661344. The cubic root of 61220069 is about 394.1225386928.

The spelling of 61220069 in words is "sixty-one million, two hundred twenty thousand, sixty-nine".