123420851 has 4 divisors (see below), whose sum is σ = 123752112. Its totient is φ = 123089592.

The previous prime is 123420821. The next prime is 123420853. The reversal of 123420851 is 158024321.

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 123420851 - 2²⁶ = 56311987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123420851.

It is not an unprimeable number, because it can be changed into a prime (123420853) 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, 165071 + ... + 165816.

It is an arithmetic number, because the mean of its divisors is an integer number (30938028).

Almost surely, 2^123420851 is an apocalyptic number.

123420851 is a deficient number, since it is larger than the sum of its proper divisors (331261).

123420851 is an equidigital number, since it uses as much as digits as its factorization.

123420851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331260.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 123420851 is about 11109.4937328395. The cubic root of 123420851 is about 497.8855387118.

The spelling of 123420851 in words is "one hundred twenty-three million, four hundred twenty thousand, eight hundred fifty-one".