61567799 has 2 divisors, whose sum is σ = 61567800. Its totient is φ = 61567798.

The previous prime is 61567777. The next prime is 61567801. The reversal of 61567799 is 99776516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61567799 is a prime.

Together with 61567801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61567769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783899 + 30783900.

It is an arithmetic number, because the mean of its divisors is an integer number (30783900).

Almost surely, 2^61567799 is an apocalyptic number.

61567799 is a deficient number, since it is larger than the sum of its proper divisors (1).

61567799 is an equidigital number, since it uses as much as digits as its factorization.

61567799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 50.

The square root of 61567799 is about 7846.5150863297. The cubic root of 61567799 is about 394.8673356760.

The spelling of 61567799 in words is "sixty-one million, five hundred sixty-seven thousand, seven hundred ninety-nine".