61315169161 has 9 divisors (see below), whose sum is σ = 61682587239. Its totient is φ = 60949931136.

The previous prime is 61315169131. The next prime is 61315169197. The reversal of 61315169161 is 16196151316.

The square root of 61315169161 is 247619.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14855953225 + 46459215936 = 121885^2 + 215544^2 .

It is not a de Polignac number, because 61315169161 - 2⁵ = 61315169129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61315169131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47789826 + ... + 47791108.

Almost surely, 2^61315169161 is an apocalyptic number.

61315169161 is the 247619-th square number.

61315169161 is the 123810-th centered octagonal number.

It is an amenable number.

61315169161 is a deficient number, since it is larger than the sum of its proper divisors (367418078).

61315169161 is an frugal number, since it uses more digits than its factorization.

61315169161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952 (or 1476 counting only the distinct ones).

The product of its digits is 29160, while the sum is 40.

The spelling of 61315169161 in words is "sixty-one billion, three hundred fifteen million, one hundred sixty-nine thousand, one hundred sixty-one".