153861 has 4 divisors (see below), whose sum is σ = 205152. Its totient is φ = 102572.

The previous prime is 153841. The next prime is 153871. The reversal of 153861 is 168351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 153861 - 2⁷ = 153733 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (153841) 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 3 ways as a sum of consecutive naturals, for example, 25641 + ... + 25646.

It is an arithmetic number, because the mean of its divisors is an integer number (51288).

2¹⁵³⁸⁶¹ is an apocalyptic number.

It is an amenable number.

153861 is a deficient number, since it is larger than the sum of its proper divisors (51291).

153861 is an equidigital number, since it uses as much as digits as its factorization.

153861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51290.

The product of its digits is 720, while the sum is 24.

The square root of 153861 is about 392.2511950269. The cubic root of 153861 is about 53.5849525221.

The spelling of 153861 in words is "one hundred fifty-three thousand, eight hundred sixty-one".