61147561 has 2 divisors, whose sum is σ = 61147562. Its totient is φ = 61147560.

The previous prime is 61147507. The next prime is 61147609. The reversal of 61147561 is 16574116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40717161 + 20430400 = 6381^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 61147561 - 2¹⁹ = 60623273 is a prime.

It is not a weakly prime, because it can be changed into another prime (61147061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30573780 + 30573781.

It is an arithmetic number, because the mean of its divisors is an integer number (30573781).

Almost surely, 2^61147561 is an apocalyptic number.

It is an amenable number.

61147561 is a deficient number, since it is larger than the sum of its proper divisors (1).

61147561 is an equidigital number, since it uses as much as digits as its factorization.

61147561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 61147561 is about 7819.6905949021. The cubic root of 61147561 is about 393.9668798978.

The spelling of 61147561 in words is "sixty-one million, one hundred forty-seven thousand, five hundred sixty-one".