1123139959 has 2 divisors, whose sum is σ = 1123139960. Its totient is φ = 1123139958.

The previous prime is 1123139939. The next prime is 1123139971. The reversal of 1123139959 is 9599313211.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1123139959 - 2¹⁵ = 1123107191 is a prime.

It is a super-2 number, since 2×1123139959² = 2522886735005043362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123139929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561569979 + 561569980.

It is an arithmetic number, because the mean of its divisors is an integer number (561569980).

Almost surely, 2^1123139959 is an apocalyptic number.

1123139959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123139959 is an equidigital number, since it uses as much as digits as its factorization.

1123139959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65610, while the sum is 43.

The square root of 1123139959 is about 33513.2803378004. The cubic root of 1123139959 is about 1039.4684040484.

The spelling of 1123139959 in words is "one billion, one hundred twenty-three million, one hundred thirty-nine thousand, nine hundred fifty-nine".