1261227317 has 12 divisors (see below), whose sum is σ = 1467990540. Its totient is φ = 1080426816.

The previous prime is 1261227307. The next prime is 1261227361. The reversal of 1261227317 is 7137221621.

It can be written as a sum of positive squares in 2 ways, for example, as 345922801 + 915304516 = 18599^2 + 30254^2 .

It is not a de Polignac number, because 1261227317 - 2¹⁰ = 1261226293 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 (1261227307) 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, 91409 + ... + 104297.

It is an arithmetic number, because the mean of its divisors is an integer number (122332545).

Almost surely, 2^1261227317 is an apocalyptic number.

It is an amenable number.

1261227317 is a deficient number, since it is larger than the sum of its proper divisors (206763223).

1261227317 is a wasteful number, since it uses less digits than its factorization.

1261227317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14900 (or 14893 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 1261227317 is about 35513.7623605272. The cubic root of 1261227317 is about 1080.4328731740.

Adding to 1261227317 its reverse (7137221621), we get a palindrome (8398448938).

The spelling of 1261227317 in words is "one billion, two hundred sixty-one million, two hundred twenty-seven thousand, three hundred seventeen".