1261271441 has 16 divisors (see below), whose sum is σ = 1300512000. Its totient is φ = 1222776000.

The previous prime is 1261271437. The next prime is 1261271483. The reversal of 1261271441 is 1441721621.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1261271441 - 2² = 1261271437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261271491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1371980 + ... + 1372898.

It is an arithmetic number, because the mean of its divisors is an integer number (81282000).

Almost surely, 2^1261271441 is an apocalyptic number.

It is an amenable number.

1261271441 is a deficient number, since it is larger than the sum of its proper divisors (39240559).

1261271441 is a wasteful number, since it uses less digits than its factorization.

1261271441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its digits is 2688, while the sum is 29.

The square root of 1261271441 is about 35514.3835790515. The cubic root of 1261271441 is about 1080.4454726643.

The spelling of 1261271441 in words is "one billion, two hundred sixty-one million, two hundred seventy-one thousand, four hundred forty-one".