61999085 has 16 divisors (see below), whose sum is σ = 78966576. Its totient is φ = 46568448.

The previous prime is 61999081. The next prime is 61999097. The reversal of 61999085 is 58099916.

It can be written as a sum of positive squares in 8 ways, for example, as 7327849 + 54671236 = 2707^2 + 7394^2 .

It is a cyclic number.

It is not a de Polignac number, because 61999085 - 2² = 61999081 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61999081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54947 + ... + 56063.

It is an arithmetic number, because the mean of its divisors is an integer number (4935411).

Almost surely, 2^61999085 is an apocalyptic number.

It is an amenable number.

61999085 is a deficient number, since it is larger than the sum of its proper divisors (16967491).

61999085 is a wasteful number, since it uses less digits than its factorization.

61999085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 61999085 is about 7873.9497712393. The cubic root of 61999085 is about 395.7872139311.

The spelling of 61999085 in words is "sixty-one million, nine hundred ninety-nine thousand, eighty-five".