1261139119 has 2 divisors, whose sum is σ = 1261139120. Its totient is φ = 1261139118.

The previous prime is 1261139069. The next prime is 1261139123. The reversal of 1261139119 is 9119311621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1261139119 - 2⁹ = 1261138607 is a prime.

It is a super-2 number, since 2×1261139119² = 3180943754944192322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261139149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630569559 + 630569560.

It is an arithmetic number, because the mean of its divisors is an integer number (630569560).

Almost surely, 2^1261139119 is an apocalyptic number.

1261139119 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261139119 is an equidigital number, since it uses as much as digits as its factorization.

1261139119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 34.

The square root of 1261139119 is about 35512.5205948550. The cubic root of 1261139119 is about 1080.4076875899.

The spelling of 1261139119 in words is "one billion, two hundred sixty-one million, one hundred thirty-nine thousand, one hundred nineteen".