1261316341 has 4 divisors (see below), whose sum is σ = 1261506784. Its totient is φ = 1261125900.

The previous prime is 1261316323. The next prime is 1261316351. The reversal of 1261316341 is 1436131621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1261316341 - 2¹⁹ = 1260792053 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 (1261316351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84915 + ... + 98656.

It is an arithmetic number, because the mean of its divisors is an integer number (315376696).

Almost surely, 2^1261316341 is an apocalyptic number.

It is an amenable number.

1261316341 is a deficient number, since it is larger than the sum of its proper divisors (190443).

1261316341 is an equidigital number, since it uses as much as digits as its factorization.

1261316341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190442.

The product of its digits is 2592, while the sum is 28.

The square root of 1261316341 is about 35515.0157116676. The cubic root of 1261316341 is about 1080.4582934377.

Adding to 1261316341 its reverse (1436131621), we get a palindrome (2697447962).

The spelling of 1261316341 in words is "one billion, two hundred sixty-one million, three hundred sixteen thousand, three hundred forty-one".