61000138 has 8 divisors (see below), whose sum is σ = 93226788. Its totient is φ = 29924544.

The previous prime is 61000133. The next prime is 61000139. The reversal of 61000138 is 83100016.

61000138 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 2 ways, for example, as 52374169 + 8625969 = 7237^2 + 2937^2 .

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

It is not an unprimeable number, because it can be changed into a prime (61000133) 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, 287631 + ... + 287842.

Almost surely, 2^61000138 is an apocalyptic number.

61000138 is a deficient number, since it is larger than the sum of its proper divisors (32226650).

61000138 is a wasteful number, since it uses less digits than its factorization.

61000138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575528.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 61000138 is about 7810.2585104464. The cubic root of 61000138 is about 393.6500151606.

The spelling of 61000138 in words is "sixty-one million, one hundred thirty-eight", and thus it is an aban number.