61115605 has 8 divisors (see below), whose sum is σ = 74065464. Its totient is φ = 48408000.

The previous prime is 61115597. The next prime is 61115611. The reversal of 61115605 is 50651116.

61115605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4835601 + 56280004 = 2199^2 + 7502^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61115605 - 2³ = 61115597 is a prime.

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 61115605.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 60006 + ... + 61015.

It is an arithmetic number, because the mean of its divisors is an integer number (9258183).

Almost surely, 2^61115605 is an apocalyptic number.

It is an amenable number.

61115605 is a deficient number, since it is larger than the sum of its proper divisors (12949859).

61115605 is a wasteful number, since it uses less digits than its factorization.

61115605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121127.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 61115605 is about 7817.6470245209. The cubic root of 61115605 is about 393.8982382972.

The spelling of 61115605 in words is "sixty-one million, one hundred fifteen thousand, six hundred five".