1311251 has 2 divisors, whose sum is σ = 1311252. Its totient is φ = 1311250.

The previous prime is 1311241. The next prime is 1311259. The reversal of 1311251 is 1521131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655625 + 655626.

It is an arithmetic number, because the mean of its divisors is an integer number (655626).

2^1311251 is an apocalyptic number.

1311251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311251 is an equidigital number, since it uses as much as digits as its factorization.

1311251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30, while the sum is 14.

The square root of 1311251 is about 1145.0986857036. The cubic root of 1311251 is about 109.4532371928.

Adding to 1311251 its reverse (1521131), we get a palindrome (2832382).

The spelling of 1311251 in words is "one million, three hundred eleven thousand, two hundred fifty-one".