29861 has 4 divisors (see below), whose sum is σ = 32172. Its totient is φ = 27552.

The previous prime is 29851. The next prime is 29863. The reversal of 29861 is 16892.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8836 + 21025 = 94^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 29861 - 2¹⁰ = 28837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 29861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29863) 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, 1136 + ... + 1161.

It is an arithmetic number, because the mean of its divisors is an integer number (8043).

2²⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

29861 is a deficient number, since it is larger than the sum of its proper divisors (2311).

29861 is a wasteful number, since it uses less digits than its factorization.

29861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310.

The product of its digits is 864, while the sum is 26.

The square root of 29861 is about 172.8033564489. The cubic root of 29861 is about 31.0242612713.

The spelling of 29861 in words is "twenty-nine thousand, eight hundred sixty-one".