1251265247 has 2 divisors, whose sum is σ = 1251265248. Its totient is φ = 1251265246.

The previous prime is 1251265241. The next prime is 1251265261. The reversal of 1251265247 is 7425621521.

It is a weak prime.

It is an emirp because it is prime and its reverse (7425621521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251265247 - 2²² = 1247070943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251265241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625632623 + 625632624.

It is an arithmetic number, because the mean of its divisors is an integer number (625632624).

Almost surely, 2^1251265247 is an apocalyptic number.

1251265247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251265247 is an equidigital number, since it uses as much as digits as its factorization.

1251265247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33600, while the sum is 35.

The square root of 1251265247 is about 35373.2278284015. The cubic root of 1251265247 is about 1077.5806747268.

Adding to 1251265247 its reverse (7425621521), we get a palindrome (8676886768).

The spelling of 1251265247 in words is "one billion, two hundred fifty-one million, two hundred sixty-five thousand, two hundred forty-seven".