61138885 has 8 divisors (see below), whose sum is σ = 77682456. Its totient is φ = 46033920.

The previous prime is 61138859. The next prime is 61138901. The reversal of 61138885 is 58883116.

It can be written as a sum of positive squares in 4 ways, for example, as 641601 + 60497284 = 801^2 + 7778^2 .

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

It is not a de Polignac number, because 61138885 - 2¹¹ = 61136837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359556 + ... + 359725.

It is an arithmetic number, because the mean of its divisors is an integer number (9710307).

Almost surely, 2^61138885 is an apocalyptic number.

It is an amenable number.

61138885 is a deficient number, since it is larger than the sum of its proper divisors (16543571).

61138885 is a wasteful number, since it uses less digits than its factorization.

61138885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719303.

The product of its digits is 46080, while the sum is 40.

The square root of 61138885 is about 7819.1358218156. The cubic root of 61138885 is about 393.9482461847.

The spelling of 61138885 in words is "sixty-one million, one hundred thirty-eight thousand, eight hundred eighty-five".