61520579 has 2 divisors, whose sum is σ = 61520580. Its totient is φ = 61520578.

The previous prime is 61520549. The next prime is 61520593. The reversal of 61520579 is 97502516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61520579 - 2⁸ = 61520323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61520549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30760289 + 30760290.

It is an arithmetic number, because the mean of its divisors is an integer number (30760290).

Almost surely, 2^61520579 is an apocalyptic number.

61520579 is a deficient number, since it is larger than the sum of its proper divisors (1).

61520579 is an equidigital number, since it uses as much as digits as its factorization.

61520579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 61520579 is about 7843.5055300548. The cubic root of 61520579 is about 394.7663607901.

The spelling of 61520579 in words is "sixty-one million, five hundred twenty thousand, five hundred seventy-nine".