1261317 has 4 divisors (see below), whose sum is σ = 1681760. Its totient is φ = 840876.

The previous prime is 1261313. The next prime is 1261321. The reversal of 1261317 is 7131621.

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 an interprime number because it is at equal distance from previous prime (1261313) and next prime (1261321).

It is not a de Polignac number, because 1261317 - 2² = 1261313 is a prime.

It is a super-4 number, since 4×1261317⁴ (a number of 26 digits) contains 4444 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261293 and 1261302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210217 + ... + 210222.

It is an arithmetic number, because the mean of its divisors is an integer number (420440).

2^1261317 is an apocalyptic number.

It is an amenable number.

1261317 is a deficient number, since it is larger than the sum of its proper divisors (420443).

1261317 is an equidigital number, since it uses as much as digits as its factorization.

1261317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420442.

The product of its digits is 252, while the sum is 21.

The square root of 1261317 is about 1123.0837012440. The cubic root of 1261317 is about 108.0458481607.

Adding to 1261317 its reverse (7131621), we get a palindrome (8392938).

The spelling of 1261317 in words is "one million, two hundred sixty-one thousand, three hundred seventeen".