123451 has 4 divisors (see below), whose sum is σ = 126504. Its totient is φ = 120400.

The previous prime is 123449. The next prime is 123457. The reversal of 123451 is 154321.

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 123451 - 2¹ = 123449 is a prime.

It is a Duffinian number.

123451 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123457) 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, 1465 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (31626).

2¹²³⁴⁵¹ is an apocalyptic number.

123451 is a deficient number, since it is larger than the sum of its proper divisors (3053).

123451 is an equidigital number, since it uses as much as digits as its factorization.

123451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052.

The product of its digits is 120, while the sum is 16.

The square root of 123451 is about 351.3559448764. The cubic root of 123451 is about 49.7926076241.

Adding to 123451 its reverse (154321), we get a palindrome (277772).

The spelling of 123451 in words is "one hundred twenty-three thousand, four hundred fifty-one".