61916881 has 12 divisors (see below), whose sum is σ = 67455388. Its totient is φ = 56496384.

The previous prime is 61916867. The next prime is 61916893. The reversal of 61916881 is 18861916.

61916881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 33454656 + 28462225 = 5784^2 + 5335^2 .

It is not a de Polignac number, because 61916881 - 2⁹ = 61916369 is a prime.

It is a super-2 number, since 2×61916881² = 7667400305536322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61916831) 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 in 11 ways as a sum of consecutive naturals, for example, 165811 + ... + 166183.

Almost surely, 2^61916881 is an apocalyptic number.

It is an amenable number.

61916881 is a deficient number, since it is larger than the sum of its proper divisors (5538507).

61916881 is a wasteful number, since it uses less digits than its factorization.

61916881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612 (or 499 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 61916881 is about 7868.7280420663. The cubic root of 61916881 is about 395.6122130573.

The spelling of 61916881 in words is "sixty-one million, nine hundred sixteen thousand, eight hundred eighty-one".