61456561 has 2 divisors, whose sum is σ = 61456562. Its totient is φ = 61456560.

The previous prime is 61456553. The next prime is 61456579. The reversal of 61456561 is 16565416.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39187600 + 22268961 = 6260^2 + 4719^2 .

It is a cyclic number.

It is not a de Polignac number, because 61456561 - 2³ = 61456553 is a prime.

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

It is not a weakly prime, because it can be changed into another prime (61456511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30728280 + 30728281.

It is an arithmetic number, because the mean of its divisors is an integer number (30728281).

Almost surely, 2^61456561 is an apocalyptic number.

It is an amenable number.

61456561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61456561 is an equidigital number, since it uses as much as digits as its factorization.

61456561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 61456561 is about 7839.4235119682. The cubic root of 61456561 is about 394.6293826472.

It can be divided in two parts, 614 and 56561, that added together give a palindrome (57175).

The spelling of 61456561 in words is "sixty-one million, four hundred fifty-six thousand, five hundred sixty-one".