61699 has 8 divisors (see below), whose sum is σ = 69120. Its totient is φ = 54600.

The previous prime is 61687. The next prime is 61703. The reversal of 61699 is 99616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61699 - 2⁵ = 61667 is a prime.

It is a Duffinian number.

61699 is a lucky number.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 61699.

It is not an unprimeable number, because it can be changed into a prime (61609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742 + ... + 820.

It is an arithmetic number, because the mean of its divisors is an integer number (8640).

2⁶¹⁶⁹⁹ is an apocalyptic number.

61699 is a deficient number, since it is larger than the sum of its proper divisors (7421).

61699 is a wasteful number, since it uses less digits than its factorization.

61699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 2916, while the sum is 31.

The square root of 61699 is about 248.3928340351. The cubic root of 61699 is about 39.5147624146.

The spelling of 61699 in words is "sixty-one thousand, six hundred ninety-nine".