61611887 has 4 divisors (see below), whose sum is σ = 61706040. Its totient is φ = 61517736.

The previous prime is 61611839. The next prime is 61611937. The reversal of 61611887 is 78811616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61611887 - 2¹⁶ = 61546351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61611887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61611817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46088 + ... + 47405.

It is an arithmetic number, because the mean of its divisors is an integer number (15426510).

Almost surely, 2^61611887 is an apocalyptic number.

61611887 is a deficient number, since it is larger than the sum of its proper divisors (94153).

61611887 is an equidigital number, since it uses as much as digits as its factorization.

61611887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94152.

The product of its digits is 16128, while the sum is 38.

The square root of 61611887 is about 7849.3239836307. The cubic root of 61611887 is about 394.9615665217.

The spelling of 61611887 in words is "sixty-one million, six hundred eleven thousand, eight hundred eighty-seven".