61100405 has 4 divisors (see below), whose sum is σ = 73320492. Its totient is φ = 48880320.

The previous prime is 61100401. The next prime is 61100407. The reversal of 61100405 is 50400116.

It is a happy number.

61100405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 28633201 + 32467204 = 5351^2 + 5698^2 .

It is not a de Polignac number, because 61100405 - 2² = 61100401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61100401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6110036 + ... + 6110045.

It is an arithmetic number, because the mean of its divisors is an integer number (18330123).

Almost surely, 2^61100405 is an apocalyptic number.

It is an amenable number.

61100405 is a deficient number, since it is larger than the sum of its proper divisors (12220087).

61100405 is a wasteful number, since it uses less digits than its factorization.

61100405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12220086.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 61100405 is about 7816.6748045444. The cubic root of 61100405 is about 393.8655802461.

The spelling of 61100405 in words is "sixty-one million, one hundred thousand, four hundred five".