61568149 has 2 divisors, whose sum is σ = 61568150. Its totient is φ = 61568148.

The previous prime is 61568123. The next prime is 61568159. The reversal of 61568149 is 94186516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46991025 + 14577124 = 6855^2 + 3818^2 .

It is a cyclic number.

It is not a de Polignac number, because 61568149 - 2⁹ = 61567637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61568159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30784074 + 30784075.

It is an arithmetic number, because the mean of its divisors is an integer number (30784075).

Almost surely, 2^61568149 is an apocalyptic number.

It is an amenable number.

61568149 is a deficient number, since it is larger than the sum of its proper divisors (1).

61568149 is an equidigital number, since it uses as much as digits as its factorization.

61568149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 61568149 is about 7846.5373891928. The cubic root of 61568149 is about 394.8680839205.

The spelling of 61568149 in words is "sixty-one million, five hundred sixty-eight thousand, one hundred forty-nine".