61861158 has 20 divisors (see below), whose sum is σ = 138615180. Its totient is φ = 20620332.

The previous prime is 61861127. The next prime is 61861159. The reversal of 61861158 is 85116816.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61861159) 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 9 ways as a sum of consecutive naturals, for example, 190768 + ... + 191091.

It is an arithmetic number, because the mean of its divisors is an integer number (6930759).

Almost surely, 2^61861158 is an apocalyptic number.

61861158 is an abundant number, since it is smaller than the sum of its proper divisors (76754022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61861158 is a wasteful number, since it uses less digits than its factorization.

61861158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381873 (or 381864 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 61861158 is about 7865.1864567854. The cubic root of 61861158 is about 395.4934984438.

It can be divided in two parts, 618 and 61158, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 61861158 in words is "sixty-one million, eight hundred sixty-one thousand, one hundred fifty-eight".