1261853267 has 2 divisors, whose sum is σ = 1261853268. Its totient is φ = 1261853266.

The previous prime is 1261853221. The next prime is 1261853293. The reversal of 1261853267 is 7623581621.

It is a strong prime.

It is an emirp because it is prime and its reverse (7623581621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261853267 - 2⁸ = 1261853011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261853167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630926633 + 630926634.

It is an arithmetic number, because the mean of its divisors is an integer number (630926634).

Almost surely, 2^1261853267 is an apocalyptic number.

1261853267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261853267 is an equidigital number, since it uses as much as digits as its factorization.

1261853267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 1261853267 is about 35522.5740480613. The cubic root of 1261853267 is about 1080.6115840471.

The spelling of 1261853267 in words is "one billion, two hundred sixty-one million, eight hundred fifty-three thousand, two hundred sixty-seven".