61173612889 has 9 divisors (see below), whose sum is σ = 64988200957. Its totient is φ = 57571207744.

The previous prime is 61173612887. The next prime is 61173612901. The reversal of 61173612889 is 98821637116.

The square root of 61173612889 is 247333.

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

It can be written as a sum of positive squares in 4 ways, for example, as 23190721225 + 37982891664 = 152285^2 + 194892^2 .

It is not a de Polignac number, because 61173612889 - 2¹ = 61173612887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61173612887) 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, 4197387 + ... + 4211935.

Almost surely, 2^61173612889 is an apocalyptic number.

61173612889 is the 247333-rd square number.

61173612889 is the 123667-th centered octagonal number.

It is an amenable number.

61173612889 is a deficient number, since it is larger than the sum of its proper divisors (3814588068).

61173612889 is an frugal number, since it uses more digits than its factorization.

61173612889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29132 (or 14566 counting only the distinct ones).

The product of its digits is 870912, while the sum is 52.

The spelling of 61173612889 in words is "sixty-one billion, one hundred seventy-three million, six hundred twelve thousand, eight hundred eighty-nine".