61865143 has 4 divisors (see below), whose sum is σ = 62337528. Its totient is φ = 61392760.

The previous prime is 61865131. The next prime is 61865161. The reversal of 61865143 is 34156816.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61865143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61865099 and 61865108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61865173) 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, 235996 + ... + 236257.

It is an arithmetic number, because the mean of its divisors is an integer number (15584382).

Almost surely, 2^61865143 is an apocalyptic number.

61865143 is a deficient number, since it is larger than the sum of its proper divisors (472385).

61865143 is a wasteful number, since it uses less digits than its factorization.

61865143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472384.

The product of its digits is 17280, while the sum is 34.

The square root of 61865143 is about 7865.4397842714. The cubic root of 61865143 is about 395.5019906210.

The spelling of 61865143 in words is "sixty-one million, eight hundred sixty-five thousand, one hundred forty-three".