61685199 has 8 divisors (see below), whose sum is σ = 91385520. Its totient is φ = 41123448.

The previous prime is 61685159. The next prime is 61685243. The reversal of 61685199 is 99158616.

It is not a de Polignac number, because 61685199 - 2¹¹ = 61683151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61685159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142292 + ... + 1142345.

It is an arithmetic number, because the mean of its divisors is an integer number (11423190).

Almost surely, 2^61685199 is an apocalyptic number.

61685199 is a deficient number, since it is larger than the sum of its proper divisors (29700321).

61685199 is a wasteful number, since it uses less digits than its factorization.

61685199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284646 (or 2284640 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 61685199 is about 7853.9925515625. The cubic root of 61685199 is about 395.1181593843.

The spelling of 61685199 in words is "sixty-one million, six hundred eighty-five thousand, one hundred ninety-nine".