61218271 has 2 divisors, whose sum is σ = 61218272. Its totient is φ = 61218270.

The previous prime is 61218263. The next prime is 61218281. The reversal of 61218271 is 17281216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61218271 - 2³ = 61218263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61218251) 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, 30609135 + 30609136.

It is an arithmetic number, because the mean of its divisors is an integer number (30609136).

Almost surely, 2^61218271 is an apocalyptic number.

61218271 is a deficient number, since it is larger than the sum of its proper divisors (1).

61218271 is an equidigital number, since it uses as much as digits as its factorization.

61218271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 61218271 is about 7824.2105672074. The cubic root of 61218271 is about 394.1186802671.

Adding to 61218271 its reverse (17281216), we get a palindrome (78499487).

The spelling of 61218271 in words is "sixty-one million, two hundred eighteen thousand, two hundred seventy-one".