61143500 has 48 divisors (see below), whose sum is σ = 145690272. Its totient is φ = 22232000.

The previous prime is 61143479. The next prime is 61143517. The reversal of 61143500 is 534116.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59 + ... + 11058.

It is an arithmetic number, because the mean of its divisors is an integer number (3035214).

Almost surely, 2^61143500 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 61143500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72845136).

61143500 is an abundant number, since it is smaller than the sum of its proper divisors (84546772).

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

61143500 is a wasteful number, since it uses less digits than its factorization.

61143500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11147 (or 11135 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 61143500 is about 7819.4309255853. The cubic root of 61143500 is about 393.9581581822.

Adding to 61143500 its reverse (534116), we get a palindrome (61677616).

The spelling of 61143500 in words is "sixty-one million, one hundred forty-three thousand, five hundred".