1345223251 has 2 divisors, whose sum is σ = 1345223252. Its totient is φ = 1345223250.

The previous prime is 1345223249. The next prime is 1345223267. The reversal of 1345223251 is 1523225431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1345223251 - 2¹ = 1345223249 is a prime.

Together with 1345223249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1345226251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672611625 + 672611626.

It is an arithmetic number, because the mean of its divisors is an integer number (672611626).

Almost surely, 2^1345223251 is an apocalyptic number.

1345223251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345223251 is an equidigital number, since it uses as much as digits as its factorization.

1345223251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 1345223251 is about 36677.2852185109. The cubic root of 1345223251 is about 1103.9043762461.

Adding to 1345223251 its reverse (1523225431), we get a palindrome (2868448682).

The spelling of 1345223251 in words is "one billion, three hundred forty-five million, two hundred twenty-three thousand, two hundred fifty-one".