61143556 has 12 divisors (see below), whose sum is σ = 109020492. Its totient is φ = 29994848.

The previous prime is 61143553. The next prime is 61143601. The reversal of 61143556 is 65534116.

It can be written as a sum of positive squares in 2 ways, for example, as 46703556 + 14440000 = 6834^2 + 3800^2 .

It is not an unprimeable number, because it can be changed into a prime (61143553) 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, 143995 + ... + 144418.

It is an arithmetic number, because the mean of its divisors is an integer number (9085041).

Almost surely, 2^61143556 is an apocalyptic number.

It is an amenable number.

61143556 is a deficient number, since it is larger than the sum of its proper divisors (47876936).

61143556 is a wasteful number, since it uses less digits than its factorization.

61143556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288470 (or 288468 counting only the distinct ones).

The product of its digits is 10800, while the sum is 31.

The square root of 61143556 is about 7819.4345064077. The cubic root of 61143556 is about 393.9582784547.

The spelling of 61143556 in words is "sixty-one million, one hundred forty-three thousand, five hundred fifty-six".