1347231257 has 2 divisors, whose sum is σ = 1347231258. Its totient is φ = 1347231256.

The previous prime is 1347231253. The next prime is 1347231343. The reversal of 1347231257 is 7521327431.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221432601 + 125798656 = 34949^2 + 11216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1347231257 - 2² = 1347231253 is a prime.

It is not a weakly prime, because it can be changed into another prime (1347231253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673615628 + 673615629.

It is an arithmetic number, because the mean of its divisors is an integer number (673615629).

Almost surely, 2^1347231257 is an apocalyptic number.

It is an amenable number.

1347231257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1347231257 is an equidigital number, since it uses as much as digits as its factorization.

1347231257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 35.

The square root of 1347231257 is about 36704.6489834735. The cubic root of 1347231257 is about 1104.4533668067.

Adding to 1347231257 its reverse (7521327431), we get a palindrome (8868558688).

The spelling of 1347231257 in words is "one billion, three hundred forty-seven million, two hundred thirty-one thousand, two hundred fifty-seven".