1261444413 has 8 divisors (see below), whose sum is σ = 1682795776. Its totient is φ = 840528000.

The previous prime is 1261444339. The next prime is 1261444423. The reversal of 1261444413 is 3144441621.

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

It is not a de Polignac number, because 1261444413 - 2¹⁰ = 1261443389 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 (1261444423) 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, 101908 + ... + 113613.

It is an arithmetic number, because the mean of its divisors is an integer number (210349472).

Almost surely, 2^1261444413 is an apocalyptic number.

It is an amenable number.

1261444413 is a deficient number, since it is larger than the sum of its proper divisors (421351363).

1261444413 is a wasteful number, since it uses less digits than its factorization.

1261444413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217475.

The product of its digits is 9216, while the sum is 30.

The square root of 1261444413 is about 35516.8187342279. The cubic root of 1261444413 is about 1080.4948615232.

The spelling of 1261444413 in words is "one billion, two hundred sixty-one million, four hundred forty-four thousand, four hundred thirteen".