61056509 has 2 divisors, whose sum is σ = 61056510. Its totient is φ = 61056508.

The previous prime is 61056491. The next prime is 61056529. The reversal of 61056509 is 90565016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 994009 = 7750^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 61056509 - 2²⁰ = 60007933 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61056529) 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, 30528254 + 30528255.

It is an arithmetic number, because the mean of its divisors is an integer number (30528255).

Almost surely, 2^61056509 is an apocalyptic number.

It is an amenable number.

61056509 is a deficient number, since it is larger than the sum of its proper divisors (1).

61056509 is an equidigital number, since it uses as much as digits as its factorization.

61056509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 61056509 is about 7813.8664564990. The cubic root of 61056509 is about 393.7712368154.

The spelling of 61056509 in words is "sixty-one million, fifty-six thousand, five hundred nine".