61121320 has 32 divisors (see below), whose sum is σ = 148102920. Its totient is φ = 22567680.

The previous prime is 61121311. The next prime is 61121321. The reversal of 61121320 is 2312116.

It can be written as a sum of positive squares in 4 ways, for example, as 22108804 + 39012516 = 4702^2 + 6246^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61121294 and 61121303.

It is not an unprimeable number, because it can be changed into a prime (61121321) 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, 58251 + ... + 59290.

Almost surely, 2^61121320 is an apocalyptic number.

It is an amenable number.

61121320 is an abundant number, since it is smaller than the sum of its proper divisors (86981600).

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

61121320 is a wasteful number, since it uses less digits than its factorization.

61121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117565 (or 117561 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 61121320 is about 7818.0125351652. The cubic root of 61121320 is about 393.9105158940.

Adding to 61121320 its reverse (2312116), we get a palindrome (63433436).

The spelling of 61121320 in words is "sixty-one million, one hundred twenty-one thousand, three hundred twenty".