61108181 has 2 divisors, whose sum is σ = 61108182. Its totient is φ = 61108180.

The previous prime is 61108147. The next prime is 61108193. The reversal of 61108181 is 18180116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44009956 + 17098225 = 6634^2 + 4135^2 .

It is a cyclic number.

It is not a de Polignac number, because 61108181 - 2¹⁰ = 61107157 is a prime.

It is a super-2 number, since 2×61108181² = 7468419570257522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61108181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61108121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30554090 + 30554091.

It is an arithmetic number, because the mean of its divisors is an integer number (30554091).

Almost surely, 2^61108181 is an apocalyptic number.

It is an amenable number.

61108181 is a deficient number, since it is larger than the sum of its proper divisors (1).

61108181 is an equidigital number, since it uses as much as digits as its factorization.

61108181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 61108181 is about 7817.1721869228. The cubic root of 61108181 is about 393.8822880941.

Adding to 61108181 its reverse (18180116), we get a palindrome (79288297).

The spelling of 61108181 in words is "sixty-one million, one hundred eight thousand, one hundred eighty-one".