61017839 has 4 divisors (see below), whose sum is σ = 61041456. Its totient is φ = 60994224.

The previous prime is 61017833. The next prime is 61017851. The reversal of 61017839 is 93871016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61017839 - 2⁴ = 61017823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61017799 and 61017808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61017833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7379 + ... + 13284.

It is an arithmetic number, because the mean of its divisors is an integer number (15260364).

Almost surely, 2^61017839 is an apocalyptic number.

61017839 is a deficient number, since it is larger than the sum of its proper divisors (23617).

61017839 is a wasteful number, since it uses less digits than its factorization.

61017839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23616.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 61017839 is about 7811.3916173752. The cubic root of 61017839 is about 393.6880878889.

The spelling of 61017839 in words is "sixty-one million, seventeen thousand, eight hundred thirty-nine".