123243231 has 4 divisors (see below), whose sum is σ = 164324312. Its totient is φ = 82162152.

The previous prime is 123243229. The next prime is 123243233. The reversal of 123243231 is 132342321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132342321 = 3 ⋅44114107.

It is an interprime number because it is at equal distance from previous prime (123243229) and next prime (123243233).

It is not a de Polignac number, because 123243231 - 2¹ = 123243229 is a prime.

It is a super-2 number, since 2×123243231² = 30377787974638722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123243198 and 123243207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123243233) 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, 20540536 + ... + 20540541.

It is an arithmetic number, because the mean of its divisors is an integer number (41081078).

Almost surely, 2^123243231 is an apocalyptic number.

123243231 is a deficient number, since it is larger than the sum of its proper divisors (41081081).

123243231 is an equidigital number, since it uses as much as digits as its factorization.

123243231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41081080.

The product of its digits is 864, while the sum is 21.

The square root of 123243231 is about 11101.4967909737. The cubic root of 123243231 is about 497.6465815560.

Adding to 123243231 its reverse (132342321), we get a palindrome (255585552).

The spelling of 123243231 in words is "one hundred twenty-three million, two hundred forty-three thousand, two hundred thirty-one".