61861111 has 8 divisors (see below), whose sum is σ = 66744720. Its totient is φ = 56995392.

The previous prime is 61861103. The next prime is 61861127. The reversal of 61861111 is 11116816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61861111 - 2³ = 61861103 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 (61861211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3216 + ... + 11578.

It is an arithmetic number, because the mean of its divisors is an integer number (8343090).

Almost surely, 2^61861111 is an apocalyptic number.

61861111 is a deficient number, since it is larger than the sum of its proper divisors (4883609).

61861111 is a wasteful number, since it uses less digits than its factorization.

61861111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8945.

The product of its digits is 288, while the sum is 25.

The square root of 61861111 is about 7865.1834689345. The cubic root of 61861111 is about 395.4933982829.

Adding to 61861111 its reverse (11116816), we get a palindrome (72977927).

The spelling of 61861111 in words is "sixty-one million, eight hundred sixty-one thousand, one hundred eleven".