61061100 has 72 divisors (see below), whose sum is σ = 181477968. Its totient is φ = 15840000.

The previous prime is 61061089. The next prime is 61061101. The reversal of 61061100 is 116016.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 61061100.

It is not an unprimeable number, because it can be changed into a prime (61061101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8350 + ... + 13850.

Almost surely, 2^61061100 is an apocalyptic number.

61061100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61061100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90738984).

61061100 is an abundant number, since it is smaller than the sum of its proper divisors (120416868).

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

61061100 is a wasteful number, since it uses less digits than its factorization.

61061100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555 (or 5548 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 61061100 is about 7814.1602235941. The cubic root of 61061100 is about 393.7811061341.

Adding to 61061100 its reverse (116016), we get a palindrome (61177116).

The spelling of 61061100 in words is "sixty-one million, sixty-one thousand, one hundred".