61393181 has 2 divisors, whose sum is σ = 61393182. Its totient is φ = 61393180.

The previous prime is 61393093. The next prime is 61393223. The reversal of 61393181 is 18139316.

61393181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 3115225 = 7634^2 + 1765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61393181 is a prime.

It is a super-2 number, since 2×61393181² = 7538245346597522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61393081) 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, 30696590 + 30696591.

It is an arithmetic number, because the mean of its divisors is an integer number (30696591).

Almost surely, 2^61393181 is an apocalyptic number.

It is an amenable number.

61393181 is a deficient number, since it is larger than the sum of its proper divisors (1).

61393181 is an equidigital number, since it uses as much as digits as its factorization.

61393181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 61393181 is about 7835.3800801237. The cubic root of 61393181 is about 394.4936758817.

The spelling of 61393181 in words is "sixty-one million, three hundred ninety-three thousand, one hundred eighty-one".