123243247 has 2 divisors, whose sum is σ = 123243248. Its totient is φ = 123243246.

The previous prime is 123243233. The next prime is 123243257. The reversal of 123243247 is 742342321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123243247 is a prime.

It is a super-2 number, since 2×123243247² = 30377795862206018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123243257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61621623 + 61621624.

It is an arithmetic number, because the mean of its divisors is an integer number (61621624).

Almost surely, 2^123243247 is an apocalyptic number.

123243247 is a deficient number, since it is larger than the sum of its proper divisors (1).

123243247 is an equidigital number, since it uses as much as digits as its factorization.

123243247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 28.

The square root of 123243247 is about 11101.4975115973. The cubic root of 123243247 is about 497.6466030916.

Adding to 123243247 its reverse (742342321), we get a palindrome (865585568).

The spelling of 123243247 in words is "one hundred twenty-three million, two hundred forty-three thousand, two hundred forty-seven".