61816143 has 8 divisors (see below), whose sum is σ = 83651968. Its totient is φ = 40595544.

The previous prime is 61816133. The next prime is 61816207. The reversal of 61816143 is 34161816.

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

It is not a de Polignac number, because 61816143 - 2⁴ = 61816127 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61816143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61816103) 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, 153571 + ... + 153972.

It is an arithmetic number, because the mean of its divisors is an integer number (10456496).

Almost surely, 2^61816143 is an apocalyptic number.

61816143 is a deficient number, since it is larger than the sum of its proper divisors (21835825).

61816143 is a wasteful number, since it uses less digits than its factorization.

61816143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307613.

The product of its digits is 3456, while the sum is 30.

The square root of 61816143 is about 7862.3242746659. The cubic root of 61816143 is about 395.3975445341.

Adding to 61816143 its reverse (34161816), we get a palindrome (95977959).

It can be divided in two parts, 618 and 16143, that added together give a palindrome (16761).

The spelling of 61816143 in words is "sixty-one million, eight hundred sixteen thousand, one hundred forty-three".