61662173 has 2 divisors, whose sum is σ = 61662174. Its totient is φ = 61662172.

The previous prime is 61662157. The next prime is 61662187. The reversal of 61662173 is 37126616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52157284 + 9504889 = 7222^2 + 3083^2 .

It is a cyclic number.

It is not a de Polignac number, because 61662173 - 2⁴ = 61662157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61662113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30831086 + 30831087.

It is an arithmetic number, because the mean of its divisors is an integer number (30831087).

Almost surely, 2^61662173 is an apocalyptic number.

It is an amenable number.

61662173 is a deficient number, since it is larger than the sum of its proper divisors (1).

61662173 is an equidigital number, since it uses as much as digits as its factorization.

61662173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 61662173 is about 7852.5265360902. The cubic root of 61662173 is about 395.0689897123.

Adding to 61662173 its reverse (37126616), we get a palindrome (98788789).

The spelling of 61662173 in words is "sixty-one million, six hundred sixty-two thousand, one hundred seventy-three".