61000881 has 4 divisors (see below), whose sum is σ = 81334512. Its totient is φ = 40667252.

The previous prime is 61000859. The next prime is 61000897. The reversal of 61000881 is 18800016.

61000881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61000881 - 2¹⁰ = 60999857 is a prime.

It is a super-2 number, since 2×61000881² = 7442214965552322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61000481) 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 3 ways as a sum of consecutive naturals, for example, 10166811 + ... + 10166816.

It is an arithmetic number, because the mean of its divisors is an integer number (20333628).

Almost surely, 2^61000881 is an apocalyptic number.

It is an amenable number.

61000881 is a deficient number, since it is larger than the sum of its proper divisors (20333631).

61000881 is a wasteful number, since it uses less digits than its factorization.

61000881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20333630.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 61000881 is about 7810.3060759486. The cubic root of 61000881 is about 393.6516134126.

Adding to 61000881 its reverse (18800016), we get a palindrome (79800897).

The spelling of 61000881 in words is "sixty-one million, eight hundred eighty-one", and thus it is an aban number.