1251313 has 6 divisors (see below), whose sum is σ = 1455666. Its totient is φ = 1072512.

The previous prime is 1251307. The next prime is 1251317. The reversal of 1251313 is 3131521.

It can be written as a sum of positive squares in only one way, i.e., 1238769 + 12544 = 1113^2 + 112^2 .

It is not a de Polignac number, because 1251313 - 2⁹ = 1250801 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1251317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12720 + ... + 12817.

It is an arithmetic number, because the mean of its divisors is an integer number (242611).

2^1251313 is an apocalyptic number.

It is an amenable number.

1251313 is a deficient number, since it is larger than the sum of its proper divisors (204353).

1251313 is an equidigital number, since it uses as much as digits as its factorization.

1251313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25551 (or 25544 counting only the distinct ones).

The product of its digits is 90, while the sum is 16.

The square root of 1251313 is about 1118.6210260852. The cubic root of 1251313 is about 107.7594382733.

Adding to 1251313 its reverse (3131521), we get a palindrome (4382834).

The spelling of 1251313 in words is "one million, two hundred fifty-one thousand, three hundred thirteen".