61091120 has 40 divisors (see below), whose sum is σ = 142855440. Its totient is φ = 24295680.

The previous prime is 61091101. The next prime is 61091123. The reversal of 61091120 is 2119016.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a junction number, because it is equal to n+sod(n) for n = 61091092 and 61091101.

It is not an unprimeable number, because it can be changed into a prime (61091123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12371 + ... + 16589.

It is an arithmetic number, because the mean of its divisors is an integer number (3571386).

Almost surely, 2^61091120 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 61091120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71427720).

61091120 is an abundant number, since it is smaller than the sum of its proper divisors (81764320).

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

61091120 is a wasteful number, since it uses less digits than its factorization.

61091120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4413 (or 4407 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 61091120 is about 7816.0808593566. The cubic root of 61091120 is about 393.8456282389.

The spelling of 61091120 in words is "sixty-one million, ninety-one thousand, one hundred twenty".