1261367271 has 12 divisors (see below), whose sum is σ = 1831133200. Its totient is φ = 836684640.

The previous prime is 1261367227. The next prime is 1261367273. The reversal of 1261367271 is 1727631621.

It is a happy number.

1261367271 is a `hidden beast` number, since 1 + 26 + 1 + 367 + 271 = 666.

It is not a de Polignac number, because 1261367271 - 2⁷ = 1261367143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261367273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350350 + ... + 353931.

Almost surely, 2^1261367271 is an apocalyptic number.

1261367271 is a deficient number, since it is larger than the sum of its proper divisors (569765929).

1261367271 is a wasteful number, since it uses less digits than its factorization.

1261367271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704486 (or 704483 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1261367271 is about 35515.7327250896. The cubic root of 1261367271 is about 1080.4728356527.

Adding to 1261367271 its reverse (1727631621), we get a palindrome (2988998892).

The spelling of 1261367271 in words is "one billion, two hundred sixty-one million, three hundred sixty-seven thousand, two hundred seventy-one".