1005123139 has 2 divisors, whose sum is σ = 1005123140. Its totient is φ = 1005123138.

The previous prime is 1005123121. The next prime is 1005123149. The reversal of 1005123139 is 9313215001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1005123139 - 2¹⁷ = 1004992067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1005123109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502561569 + 502561570.

It is an arithmetic number, because the mean of its divisors is an integer number (502561570).

Almost surely, 2^1005123139 is an apocalyptic number.

1005123139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005123139 is an equidigital number, since it uses as much as digits as its factorization.

1005123139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1005123139 is about 31703.6770580322. The cubic root of 1005123139 is about 1001.7048049884.

The spelling of 1005123139 in words is "one billion, five million, one hundred twenty-three thousand, one hundred thirty-nine".