61859 has 4 divisors (see below), whose sum is σ = 70704. Its totient is φ = 53016.

The previous prime is 61843. The next prime is 61861. The reversal of 61859 is 95816.

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 61859 - 2⁴ = 61843 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61819) 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, 4412 + ... + 4425.

It is an arithmetic number, because the mean of its divisors is an integer number (17676).

2⁶¹⁸⁵⁹ is an apocalyptic number.

61859 is a deficient number, since it is larger than the sum of its proper divisors (8845).

61859 is an equidigital number, since it uses as much as digits as its factorization.

61859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8844.

The product of its digits is 2160, while the sum is 29.

The square root of 61859 is about 248.7146959872. The cubic root of 61859 is about 39.5488899517.

The spelling of 61859 in words is "sixty-one thousand, eight hundred fifty-nine".