61999839 has 12 divisors (see below), whose sum is σ = 97696872. Its totient is φ = 37575600.

The previous prime is 61999837. The next prime is 61999853. The reversal of 61999839 is 93899916.

It is not a de Polignac number, because 61999839 - 2¹ = 61999837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61999837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313032 + ... + 313229.

It is an arithmetic number, because the mean of its divisors is an integer number (8141406).

Almost surely, 2^61999839 is an apocalyptic number.

61999839 is a deficient number, since it is larger than the sum of its proper divisors (35697033).

61999839 is a wasteful number, since it uses less digits than its factorization.

61999839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626278 (or 626275 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 61999839 is about 7873.9976504950. The cubic root of 61999839 is about 395.7888183761.

The spelling of 61999839 in words is "sixty-one million, nine hundred ninety-nine thousand, eight hundred thirty-nine".