61561529 has 2 divisors, whose sum is σ = 61561530. Its totient is φ = 61561528.

The previous prime is 61561483. The next prime is 61561561. The reversal of 61561529 is 92516516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52591504 + 8970025 = 7252^2 + 2995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61561529 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61561579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30780764 + 30780765.

It is an arithmetic number, because the mean of its divisors is an integer number (30780765).

Almost surely, 2^61561529 is an apocalyptic number.

It is an amenable number.

61561529 is a deficient number, since it is larger than the sum of its proper divisors (1).

61561529 is an equidigital number, since it uses as much as digits as its factorization.

61561529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 61561529 is about 7846.1155357285. The cubic root of 61561529 is about 394.8539309293.

The spelling of 61561529 in words is "sixty-one million, five hundred sixty-one thousand, five hundred twenty-nine".