1265241251 has 2 divisors, whose sum is σ = 1265241252. Its totient is φ = 1265241250.

The previous prime is 1265241227. The next prime is 1265241283. The reversal of 1265241251 is 1521425621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1521425621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265241251 - 2¹⁰ = 1265240227 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265241221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632620625 + 632620626.

It is an arithmetic number, because the mean of its divisors is an integer number (632620626).

Almost surely, 2^1265241251 is an apocalyptic number.

1265241251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265241251 is an equidigital number, since it uses as much as digits as its factorization.

1265241251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 1265241251 is about 35570.2298418214. The cubic root of 1265241251 is about 1081.5778408855.

Adding to 1265241251 its reverse (1521425621), we get a palindrome (2786666872).

The spelling of 1265241251 in words is "one billion, two hundred sixty-five million, two hundred forty-one thousand, two hundred fifty-one".