1261369079 has 2 divisors, whose sum is σ = 1261369080. Its totient is φ = 1261369078.

The previous prime is 1261369027. The next prime is 1261369097. The reversal of 1261369079 is 9709631621.

Together with next prime (1261369097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261369079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261369019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630684539 + 630684540.

It is an arithmetic number, because the mean of its divisors is an integer number (630684540).

Almost surely, 2^1261369079 is an apocalyptic number.

1261369079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261369079 is an equidigital number, since it uses as much as digits as its factorization.

1261369079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1261369079 is about 35515.7581785888. The cubic root of 1261369079 is about 1080.4733518899.

The spelling of 1261369079 in words is "one billion, two hundred sixty-one million, three hundred sixty-nine thousand, seventy-nine".