123851 has 8 divisors (see below), whose sum is σ = 152544. Its totient is φ = 97920.

The previous prime is 123833. The next prime is 123853. The reversal of 123851 is 158321.

123851 = 130² + 131² + ... + 136².

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 123851 - 2⁶ = 123787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590 + ... + 771.

It is an arithmetic number, because the mean of its divisors is an integer number (19068).

2¹²³⁸⁵¹ is an apocalyptic number.

123851 is a deficient number, since it is larger than the sum of its proper divisors (28693).

123851 is a wasteful number, since it uses less digits than its factorization.

123851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its digits is 240, while the sum is 20.

The square root of 123851 is about 351.9247078567. The cubic root of 123851 is about 49.8463281833.

The spelling of 123851 in words is "one hundred twenty-three thousand, eight hundred fifty-one".