61115213 has 2 divisors, whose sum is σ = 61115214. Its totient is φ = 61115212.

The previous prime is 61115203. The next prime is 61115227. The reversal of 61115213 is 31251116.

61115213 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., 52809289 + 8305924 = 7267^2 + 2882^2 .

It is a cyclic number.

It is not a de Polignac number, because 61115213 - 2¹⁸ = 60853069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61115203) 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, 30557606 + 30557607.

It is an arithmetic number, because the mean of its divisors is an integer number (30557607).

Almost surely, 2^61115213 is an apocalyptic number.

It is an amenable number.

61115213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61115213 is an equidigital number, since it uses as much as digits as its factorization.

61115213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 20.

The square root of 61115213 is about 7817.6219529982. The cubic root of 61115213 is about 393.8973961313.

Adding to 61115213 its reverse (31251116), we get a palindrome (92366329).

The spelling of 61115213 in words is "sixty-one million, one hundred fifteen thousand, two hundred thirteen".