61681273 has 2 divisors, whose sum is σ = 61681274. Its totient is φ = 61681272.

The previous prime is 61681271. The next prime is 61681313. The reversal of 61681273 is 37218616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 11664 = 7853^2 + 108^2 .

It is a cyclic number.

It is not a de Polignac number, because 61681273 - 2¹ = 61681271 is a prime.

Together with 61681271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61681271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30840636 + 30840637.

It is an arithmetic number, because the mean of its divisors is an integer number (30840637).

Almost surely, 2^61681273 is an apocalyptic number.

It is an amenable number.

61681273 is a deficient number, since it is larger than the sum of its proper divisors (1).

61681273 is an equidigital number, since it uses as much as digits as its factorization.

61681273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 61681273 is about 7853.7426110104. The cubic root of 61681273 is about 395.1097766775.

Adding to 61681273 its reverse (37218616), we get a palindrome (98899889).

The spelling of 61681273 in words is "sixty-one million, six hundred eighty-one thousand, two hundred seventy-three".