61999039 has 4 divisors (see below), whose sum is σ = 63999040. Its totient is φ = 59999040.

The previous prime is 61999037. The next prime is 61999043. The reversal of 61999039 is 93099916.

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 61999039 - 2¹ = 61999037 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 61999039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61999031) 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, 999954 + ... + 1000015.

It is an arithmetic number, because the mean of its divisors is an integer number (15999760).

Almost surely, 2^61999039 is an apocalyptic number.

61999039 is a deficient number, since it is larger than the sum of its proper divisors (2000001).

61999039 is a wasteful number, since it uses less digits than its factorization.

61999039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000000.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 61999039 is about 7873.9468502143. The cubic root of 61999039 is about 395.7871160468.

The spelling of 61999039 in words is "sixty-one million, nine hundred ninety-nine thousand, thirty-nine".