1312217251 has 2 divisors, whose sum is σ = 1312217252. Its totient is φ = 1312217250.

The previous prime is 1312217209. The next prime is 1312217279. The reversal of 1312217251 is 1527122131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312217251 - 2⁹ = 1312216739 is a prime.

It is a super-2 number, since 2×1312217251² = 3443828227643994002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1312217281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656108625 + 656108626.

It is an arithmetic number, because the mean of its divisors is an integer number (656108626).

Almost surely, 2^1312217251 is an apocalyptic number.

1312217251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312217251 is an equidigital number, since it uses as much as digits as its factorization.

1312217251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 1312217251 is about 36224.5393483478. The cubic root of 1312217251 is about 1094.8011568075.

Adding to 1312217251 its reverse (1527122131), we get a palindrome (2839339382).

The spelling of 1312217251 in words is "one billion, three hundred twelve million, two hundred seventeen thousand, two hundred fifty-one".