61556871 has 4 divisors (see below), whose sum is σ = 82075832. Its totient is φ = 41037912.

The previous prime is 61556851. The next prime is 61556893. The reversal of 61556871 is 17865516.

61556871 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 is not a de Polignac number, because 61556871 - 2⁵ = 61556839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61556851) 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, 10259476 + ... + 10259481.

It is an arithmetic number, because the mean of its divisors is an integer number (20518958).

Almost surely, 2^61556871 is an apocalyptic number.

61556871 is a deficient number, since it is larger than the sum of its proper divisors (20518961).

61556871 is a wasteful number, since it uses less digits than its factorization.

61556871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20518960.

The product of its digits is 50400, while the sum is 39.

The square root of 61556871 is about 7845.8186953307. The cubic root of 61556871 is about 394.8439719174.

The spelling of 61556871 in words is "sixty-one million, five hundred fifty-six thousand, eight hundred seventy-one".