1001311123 has 2 divisors, whose sum is σ = 1001311124. Its totient is φ = 1001311122.

The previous prime is 1001311111. The next prime is 1001311133. The reversal of 1001311123 is 3211131001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001311123 is a prime.

It is a super-2 number, since 2×1001311123² = 2005247930087042258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1001311133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500655561 + 500655562.

It is an arithmetic number, because the mean of its divisors is an integer number (500655562).

Almost surely, 2^1001311123 is an apocalyptic number.

1001311123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001311123 is an equidigital number, since it uses as much as digits as its factorization.

1001311123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1001311123 is about 31643.5004858818. The cubic root of 1001311123 is about 1000.4368501342.

Adding to 1001311123 its reverse (3211131001), we get a palindrome (4212442124).

The spelling of 1001311123 in words is "one billion, one million, three hundred eleven thousand, one hundred twenty-three".