61105639 has 8 divisors (see below), whose sum is σ = 72243360. Its totient is φ = 50570016.

The previous prime is 61105613. The next prime is 61105663. The reversal of 61105639 is 93650116.

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

It is not a de Polignac number, because 61105639 - 2⁵ = 61105607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61105639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61705639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150304 + ... + 150709.

It is an arithmetic number, because the mean of its divisors is an integer number (9030420).

Almost surely, 2^61105639 is an apocalyptic number.

61105639 is a deficient number, since it is larger than the sum of its proper divisors (11137721).

61105639 is a wasteful number, since it uses less digits than its factorization.

61105639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301049.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 61105639 is about 7817.0095944677. The cubic root of 61105639 is about 393.8768263995.

The spelling of 61105639 in words is "sixty-one million, one hundred five thousand, six hundred thirty-nine".