61861361 has 2 divisors, whose sum is σ = 61861362. Its totient is φ = 61861360.

The previous prime is 61861357. The next prime is 61861363. The reversal of 61861361 is 16316816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 3136 = 7865^2 + 56^2 .

It is a cyclic number.

It is not a de Polignac number, because 61861361 - 2² = 61861357 is a prime.

Together with 61861363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61861363) 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 as a sum of consecutive naturals, namely, 30930680 + 30930681.

It is an arithmetic number, because the mean of its divisors is an integer number (30930681).

Almost surely, 2^61861361 is an apocalyptic number.

It is an amenable number.

61861361 is a deficient number, since it is larger than the sum of its proper divisors (1).

61861361 is an equidigital number, since it uses as much as digits as its factorization.

61861361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 61861361 is about 7865.1993617454. The cubic root of 61861361 is about 395.4939310528.

The spelling of 61861361 in words is "sixty-one million, eight hundred sixty-one thousand, three hundred sixty-one".