1265252243 has 4 divisors (see below), whose sum is σ = 1265440968. Its totient is φ = 1265063520.

The previous prime is 1265252221. The next prime is 1265252269. The reversal of 1265252243 is 3422525621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3422525621 = 2693 ⋅1270897.

It is a cyclic number.

It is not a de Polignac number, because 1265252243 - 2¹⁶ = 1265186707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265252203) 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 in 3 ways as a sum of consecutive naturals, for example, 83921 + ... + 97842.

It is an arithmetic number, because the mean of its divisors is an integer number (316360242).

Almost surely, 2^1265252243 is an apocalyptic number.

1265252243 is a deficient number, since it is larger than the sum of its proper divisors (188725).

1265252243 is an equidigital number, since it uses as much as digits as its factorization.

1265252243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188724.

The product of its digits is 28800, while the sum is 32.

The square root of 1265252243 is about 35570.3843527168. The cubic root of 1265252243 is about 1081.5809730073.

Adding to 1265252243 its reverse (3422525621), we get a palindrome (4687777864).

The spelling of 1265252243 in words is "one billion, two hundred sixty-five million, two hundred fifty-two thousand, two hundred forty-three".