61507879 has 2 divisors, whose sum is σ = 61507880. Its totient is φ = 61507878.

The previous prime is 61507871. The next prime is 61507891. The reversal of 61507879 is 97870516.

61507879 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 is a cyclic number.

It is not a de Polignac number, because 61507879 - 2³ = 61507871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61507871) 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, 30753939 + 30753940.

It is an arithmetic number, because the mean of its divisors is an integer number (30753940).

Almost surely, 2^61507879 is an apocalyptic number.

61507879 is a deficient number, since it is larger than the sum of its proper divisors (1).

61507879 is an equidigital number, since it uses as much as digits as its factorization.

61507879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 61507879 is about 7842.6959012829. The cubic root of 61507879 is about 394.7391943910.

The spelling of 61507879 in words is "sixty-one million, five hundred seven thousand, eight hundred seventy-nine".