61104581 has 4 divisors (see below), whose sum is σ = 61170732. Its totient is φ = 61038432.

The previous prime is 61104569. The next prime is 61104587. The reversal of 61104581 is 18540116.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7317025 + 53787556 = 2705^2 + 7334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61104581 is a prime.

It is a super-2 number, since 2×61104581² = 7467539638371122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61104581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61104587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31670 + ... + 33543.

It is an arithmetic number, because the mean of its divisors is an integer number (15292683).

Almost surely, 2^61104581 is an apocalyptic number.

It is an amenable number.

61104581 is a deficient number, since it is larger than the sum of its proper divisors (66151).

61104581 is an equidigital number, since it uses as much as digits as its factorization.

61104581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66150.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 61104581 is about 7816.9419212375. The cubic root of 61104581 is about 393.8745531555.

Adding to 61104581 its reverse (18540116), we get a palindrome (79644697).

The spelling of 61104581 in words is "sixty-one million, one hundred four thousand, five hundred eighty-one".