61185887 has 4 divisors (see below), whose sum is σ = 69926736. Its totient is φ = 52445040.

The previous prime is 61185881. The next prime is 61185889. The reversal of 61185887 is 78858116.

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 61185887 - 2¹⁰ = 61184863 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 (61185881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4370414 + ... + 4370427.

It is an arithmetic number, because the mean of its divisors is an integer number (17481684).

Almost surely, 2^61185887 is an apocalyptic number.

61185887 is a deficient number, since it is larger than the sum of its proper divisors (8740849).

61185887 is an equidigital number, since it uses as much as digits as its factorization.

61185887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8740848.

The product of its digits is 107520, while the sum is 44.

The square root of 61185887 is about 7822.1408194944. The cubic root of 61185887 is about 394.0491727474.

The spelling of 61185887 in words is "sixty-one million, one hundred eighty-five thousand, eight hundred eighty-seven".