61558979 has 2 divisors, whose sum is σ = 61558980. Its totient is φ = 61558978.

The previous prime is 61558883. The next prime is 61559011. The reversal of 61558979 is 97985516.

It is a happy number.

61558979 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 is a cyclic number.

It is not a de Polignac number, because 61558979 - 2⁸ = 61558723 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61552979) 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, 30779489 + 30779490.

It is an arithmetic number, because the mean of its divisors is an integer number (30779490).

Almost surely, 2^61558979 is an apocalyptic number.

61558979 is a deficient number, since it is larger than the sum of its proper divisors (1).

61558979 is an equidigital number, since it uses as much as digits as its factorization.

61558979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 50.

The square root of 61558979 is about 7845.9530332522. The cubic root of 61558979 is about 394.8484789778.

The spelling of 61558979 in words is "sixty-one million, five hundred fifty-eight thousand, nine hundred seventy-nine".