61275917 has 2 divisors, whose sum is σ = 61275918. Its totient is φ = 61275916.

The previous prime is 61275913. The next prime is 61275919. The reversal of 61275917 is 71957216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 264196 = 7811^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 61275917 - 2² = 61275913 is a prime.

Together with 61275919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61275913) 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, 30637958 + 30637959.

It is an arithmetic number, because the mean of its divisors is an integer number (30637959).

Almost surely, 2^61275917 is an apocalyptic number.

It is an amenable number.

61275917 is a deficient number, since it is larger than the sum of its proper divisors (1).

61275917 is an equidigital number, since it uses as much as digits as its factorization.

61275917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 38.

The square root of 61275917 is about 7827.8935225257. The cubic root of 61275917 is about 394.2423483464.

The spelling of 61275917 in words is "sixty-one million, two hundred seventy-five thousand, nine hundred seventeen".