1247311123 has 2 divisors, whose sum is σ = 1247311124. Its totient is φ = 1247311122.

The previous prime is 1247311099. The next prime is 1247311127. The reversal of 1247311123 is 3211137421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247311123 is a prime.

It is a super-2 number, since 2×1247311123² = 3111570075119042258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1247311127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623655561 + 623655562.

It is an arithmetic number, because the mean of its divisors is an integer number (623655562).

Almost surely, 2^1247311123 is an apocalyptic number.

1247311123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247311123 is an equidigital number, since it uses as much as digits as its factorization.

1247311123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 1247311123 is about 35317.2921243971. The cubic root of 1247311123 is about 1076.4443891971. Note that the first 3 decimals are identical.

Adding to 1247311123 its reverse (3211137421), we get a palindrome (4458448544).

The spelling of 1247311123 in words is "one billion, two hundred forty-seven million, three hundred eleven thousand, one hundred twenty-three".