61172161 has 2 divisors, whose sum is σ = 61172162. Its totient is φ = 61172160.

The previous prime is 61172159. The next prime is 61172179. The reversal of 61172161 is 16127116.

It is a happy number.

61172161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41679936 + 19492225 = 6456^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 61172161 - 2¹ = 61172159 is a prime.

Together with 61172159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61172561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30586080 + 30586081.

It is an arithmetic number, because the mean of its divisors is an integer number (30586081).

Almost surely, 2^61172161 is an apocalyptic number.

It is an amenable number.

61172161 is a deficient number, since it is larger than the sum of its proper divisors (1).

61172161 is an equidigital number, since it uses as much as digits as its factorization.

61172161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 25.

The square root of 61172161 is about 7821.2633889929. The cubic root of 61172161 is about 394.0197044952.

Adding to 61172161 its reverse (16127116), we get a palindrome (77299277).

The spelling of 61172161 in words is "sixty-one million, one hundred seventy-two thousand, one hundred sixty-one".