1312374221 has 2 divisors, whose sum is σ = 1312374222. Its totient is φ = 1312374220.

The previous prime is 1312374209. The next prime is 1312374223. The reversal of 1312374221 is 1224732131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1031308996 + 281065225 = 32114^2 + 16765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312374221 - 2⁶ = 1312374157 is a prime.

Together with 1312374223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312374223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656187110 + 656187111.

It is an arithmetic number, because the mean of its divisors is an integer number (656187111).

Almost surely, 2^1312374221 is an apocalyptic number.

It is an amenable number.

1312374221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312374221 is an equidigital number, since it uses as much as digits as its factorization.

1312374221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 1312374221 is about 36226.7059087629. The cubic root of 1312374221 is about 1094.8448091539.

The spelling of 1312374221 in words is "one billion, three hundred twelve million, three hundred seventy-four thousand, two hundred twenty-one".