61155144 has 48 divisors (see below), whose sum is σ = 166533120. Its totient is φ = 20273760.

The previous prime is 61155139. The next prime is 61155161. The reversal of 61155144 is 44155116.

61155144 is a `hidden beast` number, since 611 + 5 + 5 + 1 + 44 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11529 + ... + 15975.

It is an arithmetic number, because the mean of its divisors is an integer number (3469440).

Almost surely, 2^61155144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61155144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83266560).

61155144 is an abundant number, since it is smaller than the sum of its proper divisors (105377976).

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

61155144 is a wasteful number, since it uses less digits than its factorization.

61155144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650 (or 4643 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 61155144 is about 7820.1754456022. The cubic root of 61155144 is about 393.9831646976.

It can be divided in two parts, 611 and 55144, that added together give a palindrome (55755).

The spelling of 61155144 in words is "sixty-one million, one hundred fifty-five thousand, one hundred forty-four".