61968397 has 2 divisors, whose sum is σ = 61968398. Its totient is φ = 61968396.

The previous prime is 61968373. The next prime is 61968407. The reversal of 61968397 is 79386916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53377636 + 8590761 = 7306^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 61968397 - 2¹¹ = 61966349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61968397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61968307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30984198 + 30984199.

It is an arithmetic number, because the mean of its divisors is an integer number (30984199).

Almost surely, 2^61968397 is an apocalyptic number.

It is an amenable number.

61968397 is a deficient number, since it is larger than the sum of its proper divisors (1).

61968397 is an equidigital number, since it uses as much as digits as its factorization.

61968397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 61968397 is about 7872.0008257113. Note that the first 3 decimals coincide. The cubic root of 61968397 is about 395.7219015557.

The spelling of 61968397 in words is "sixty-one million, nine hundred sixty-eight thousand, three hundred ninety-seven".