61240561 has 2 divisors, whose sum is σ = 61240562. Its totient is φ = 61240560.

The previous prime is 61240541. The next prime is 61240583. The reversal of 61240561 is 16504216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48566961 + 12673600 = 6969^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 61240561 - 2⁷ = 61240433 is a prime.

It is not a weakly prime, because it can be changed into another prime (61240541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30620280 + 30620281.

It is an arithmetic number, because the mean of its divisors is an integer number (30620281).

Almost surely, 2^61240561 is an apocalyptic number.

It is an amenable number.

61240561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61240561 is an equidigital number, since it uses as much as digits as its factorization.

61240561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61240561 is about 7825.6348624249. The cubic root of 61240561 is about 394.1665082507.

Adding to 61240561 its reverse (16504216), we get a palindrome (77744777).

The spelling of 61240561 in words is "sixty-one million, two hundred forty thousand, five hundred sixty-one".