61821841 has 2 divisors, whose sum is σ = 61821842. Its totient is φ = 61821840.

The previous prime is 61821833. The next prime is 61821871. The reversal of 61821841 is 14812816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46580625 + 15241216 = 6825^2 + 3904^2 .

It is a cyclic number.

It is not a de Polignac number, because 61821841 - 2³ = 61821833 is a prime.

It is not a weakly prime, because it can be changed into another prime (61821811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910920 + 30910921.

It is an arithmetic number, because the mean of its divisors is an integer number (30910921).

Almost surely, 2^61821841 is an apocalyptic number.

It is an amenable number.

61821841 is a deficient number, since it is larger than the sum of its proper divisors (1).

61821841 is an equidigital number, since it uses as much as digits as its factorization.

61821841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 31.

The square root of 61821841 is about 7862.6866273558. The cubic root of 61821841 is about 395.4096929573.

The spelling of 61821841 in words is "sixty-one million, eight hundred twenty-one thousand, eight hundred forty-one".