1261427278341 has 8 divisors (see below), whose sum is σ = 1686722245600. Its totient is φ = 838541914992.

The previous prime is 1261427278339. The next prime is 1261427278357. The reversal of 1261427278341 is 1438727241621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261427278341 - 2¹ = 1261427278339 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 (1261427278301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602399755 + ... + 602401848.

It is an arithmetic number, because the mean of its divisors is an integer number (210840280700).

Almost surely, 2^{1261427278341} is an apocalyptic number.

It is an amenable number.

1261427278341 is a deficient number, since it is larger than the sum of its proper divisors (425294967259).

1261427278341 is a wasteful number, since it uses less digits than its factorization.

1261427278341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204801955.

The product of its digits is 903168, while the sum is 48.

The spelling of 1261427278341 in words is "one trillion, two hundred sixty-one billion, four hundred twenty-seven million, two hundred seventy-eight thousand, three hundred forty-one".