1261369099 has 2 divisors, whose sum is σ = 1261369100. Its totient is φ = 1261369098.

The previous prime is 1261369097. The next prime is 1261369129. The reversal of 1261369099 is 9909631621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261369099 - 2¹ = 1261369097 is a prime.

Together with 1261369097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1261369097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630684549 + 630684550.

It is an arithmetic number, because the mean of its divisors is an integer number (630684550).

Almost surely, 2^1261369099 is an apocalyptic number.

1261369099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261369099 is an equidigital number, since it uses as much as digits as its factorization.

1261369099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 1261369099 is about 35515.7584601540. The cubic root of 1261369099 is about 1080.4733576005.

The spelling of 1261369099 in words is "one billion, two hundred sixty-one million, three hundred sixty-nine thousand, ninety-nine".