61216657 has 2 divisors, whose sum is σ = 61216658. Its totient is φ = 61216656.

The previous prime is 61216637. The next prime is 61216663. The reversal of 61216657 is 75661216.

It is a happy number.

61216657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61214976 + 1681 = 7824^2 + 41^2 .

It is a cyclic number.

It is not a de Polignac number, because 61216657 - 2¹¹ = 61214609 is a prime.

It is not a weakly prime, because it can be changed into another prime (61216637) 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, 30608328 + 30608329.

It is an arithmetic number, because the mean of its divisors is an integer number (30608329).

Almost surely, 2^61216657 is an apocalyptic number.

It is an amenable number.

61216657 is a deficient number, since it is larger than the sum of its proper divisors (1).

61216657 is an equidigital number, since it uses as much as digits as its factorization.

61216657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 61216657 is about 7824.1074251316. The cubic root of 61216657 is about 394.1152166327.

The spelling of 61216657 in words is "sixty-one million, two hundred sixteen thousand, six hundred fifty-seven".