61216885 has 4 divisors (see below), whose sum is σ = 73460268. Its totient is φ = 48973504.

The previous prime is 61216877. The next prime is 61216913. The reversal of 61216885 is 58861216.

61216885 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.

It can be written as a sum of positive squares in 2 ways, for example, as 42915601 + 18301284 = 6551^2 + 4278^2 .

It is a cyclic number.

It is not a de Polignac number, because 61216885 - 2³ = 61216877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6121684 + ... + 6121693.

It is an arithmetic number, because the mean of its divisors is an integer number (18365067).

Almost surely, 2^61216885 is an apocalyptic number.

It is an amenable number.

61216885 is a deficient number, since it is larger than the sum of its proper divisors (12243383).

61216885 is a wasteful number, since it uses less digits than its factorization.

61216885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12243382.

The product of its digits is 23040, while the sum is 37.

The square root of 61216885 is about 7824.1219954702. The cubic root of 61216885 is about 394.1157059230.

The spelling of 61216885 in words is "sixty-one million, two hundred sixteen thousand, eight hundred eighty-five".