61887181 has 6 divisors (see below), whose sum is σ = 64695470. Its totient is φ = 59195928.

The previous prime is 61887179. The next prime is 61887223. The reversal of 61887181 is 18178816.

It is a happy number.

61887181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 61873956 + 13225 = 7866^2 + 115^2 .

It is not a de Polignac number, because 61887181 - 2¹ = 61887179 is a prime.

It is a super-2 number, since 2×61887181² = 7660046344253522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61887101) 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 5 ways as a sum of consecutive naturals, for example, 57966 + ... + 59023.

Almost surely, 2^61887181 is an apocalyptic number.

It is an amenable number.

61887181 is a deficient number, since it is larger than the sum of its proper divisors (2808289).

61887181 is a wasteful number, since it uses less digits than its factorization.

61887181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117035 (or 117012 counting only the distinct ones).

The product of its digits is 21504, while the sum is 40.

The square root of 61887181 is about 7866.8405983597. The cubic root of 61887181 is about 395.5489478018.

The spelling of 61887181 in words is "sixty-one million, eight hundred eighty-seven thousand, one hundred eighty-one".