61881863 has 2 divisors, whose sum is σ = 61881864. Its totient is φ = 61881862.

The previous prime is 61881821. The next prime is 61881901. The reversal of 61881863 is 36818816.

61881863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61881863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61881863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61883863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30940931 + 30940932.

It is an arithmetic number, because the mean of its divisors is an integer number (30940932).

Almost surely, 2^61881863 is an apocalyptic number.

61881863 is a deficient number, since it is larger than the sum of its proper divisors (1).

61881863 is an equidigital number, since it uses as much as digits as its factorization.

61881863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 61881863 is about 7866.5025900968. The cubic root of 61881863 is about 395.5376175633.

The spelling of 61881863 in words is "sixty-one million, eight hundred eighty-one thousand, eight hundred sixty-three".