247142123 has 2 divisors, whose sum is σ = 247142124. Its totient is φ = 247142122.

The previous prime is 247142117. The next prime is 247142167. The reversal of 247142123 is 321241742.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247142123 is a prime.

It is a super-2 number, since 2×247142123² = 122158457921894258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 247142092 and 247142101.

It is not a weakly prime, because it can be changed into another prime (247142173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123571061 + 123571062.

It is an arithmetic number, because the mean of its divisors is an integer number (123571062).

Almost surely, 2^247142123 is an apocalyptic number.

247142123 is a deficient number, since it is larger than the sum of its proper divisors (1).

247142123 is an equidigital number, since it uses as much as digits as its factorization.

247142123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 247142123 is about 15720.7545302380. The cubic root of 247142123 is about 627.5508531667.

Adding to 247142123 its reverse (321241742), we get a palindrome (568383865).

The spelling of 247142123 in words is "two hundred forty-seven million, one hundred forty-two thousand, one hundred twenty-three".