61215653 has 2 divisors, whose sum is σ = 61215654. Its totient is φ = 61215652.

The previous prime is 61215643. The next prime is 61215659. The reversal of 61215653 is 35651216.

61215653 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., 41705764 + 19509889 = 6458^2 + 4417^2 .

It is a cyclic number.

It is not a de Polignac number, because 61215653 - 2¹⁸ = 60953509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61215659) 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, 30607826 + 30607827.

It is an arithmetic number, because the mean of its divisors is an integer number (30607827).

Almost surely, 2^61215653 is an apocalyptic number.

It is an amenable number.

61215653 is a deficient number, since it is larger than the sum of its proper divisors (1).

61215653 is an equidigital number, since it uses as much as digits as its factorization.

61215653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 61215653 is about 7824.0432641953. The cubic root of 61215653 is about 394.1130620239.

Adding to 61215653 its reverse (35651216), we get a palindrome (96866869).

The spelling of 61215653 in words is "sixty-one million, two hundred fifteen thousand, six hundred fifty-three".