61561163 has 4 divisors (see below), whose sum is σ = 61825608. Its totient is φ = 61296720.

The previous prime is 61561151. The next prime is 61561169. The reversal of 61561163 is 36116516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61561163 - 2¹⁰ = 61560139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61561169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131873 + ... + 132338.

It is an arithmetic number, because the mean of its divisors is an integer number (15456402).

Almost surely, 2^61561163 is an apocalyptic number.

61561163 is a deficient number, since it is larger than the sum of its proper divisors (264445).

61561163 is a wasteful number, since it uses less digits than its factorization.

61561163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264444.

The product of its digits is 3240, while the sum is 29.

The square root of 61561163 is about 7846.0922120505. The cubic root of 61561163 is about 394.8531484232.

Adding to 61561163 its reverse (36116516), we get a palindrome (97677679).

The spelling of 61561163 in words is "sixty-one million, five hundred sixty-one thousand, one hundred sixty-three".