61574609 has 2 divisors, whose sum is σ = 61574610. Its totient is φ = 61574608.

The previous prime is 61574543. The next prime is 61574621. The reversal of 61574609 is 90647516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61277584 + 297025 = 7828^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 61574609 - 2⁸ = 61574353 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61576609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30787304 + 30787305.

It is an arithmetic number, because the mean of its divisors is an integer number (30787305).

Almost surely, 2^61574609 is an apocalyptic number.

It is an amenable number.

61574609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61574609 is an equidigital number, since it uses as much as digits as its factorization.

61574609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 61574609 is about 7846.9490249396. The cubic root of 61574609 is about 394.8818938675.

The spelling of 61574609 in words is "sixty-one million, five hundred seventy-four thousand, six hundred nine".