1251345523 has 2 divisors, whose sum is σ = 1251345524. Its totient is φ = 1251345522.

The previous prime is 1251345497. The next prime is 1251345527. The reversal of 1251345523 is 3255431521.

It is a strong prime.

It is an emirp because it is prime and its reverse (3255431521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251345523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251345527) 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, 625672761 + 625672762.

It is an arithmetic number, because the mean of its divisors is an integer number (625672762).

Almost surely, 2^1251345523 is an apocalyptic number.

1251345523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251345523 is an equidigital number, since it uses as much as digits as its factorization.

1251345523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 31.

The square root of 1251345523 is about 35374.3625101570. The cubic root of 1251345523 is about 1077.6037186062.

The spelling of 1251345523 in words is "one billion, two hundred fifty-one million, three hundred forty-five thousand, five hundred twenty-three".