1265834489 has 2 divisors, whose sum is σ = 1265834490. Its totient is φ = 1265834488.

The previous prime is 1265834461. The next prime is 1265834539. The reversal of 1265834489 is 9844385621.

It is an a-pointer prime, because the next prime (1265834539) can be obtained adding 1265834489 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1134342400 + 131492089 = 33680^2 + 11467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265834489 - 2¹² = 1265830393 is a prime.

It is a super-2 number, since 2×1265834489² = 3204673907083782242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1265834419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632917244 + 632917245.

It is an arithmetic number, because the mean of its divisors is an integer number (632917245).

Almost surely, 2^1265834489 is an apocalyptic number.

It is an amenable number.

1265834489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265834489 is an equidigital number, since it uses as much as digits as its factorization.

1265834489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 50.

The square root of 1265834489 is about 35578.5678323341. The cubic root of 1265834489 is about 1081.7468555087.

It can be divided in two parts, 126583 and 4489, that added together give a 17-th power (131072 = 2¹⁷).

The spelling of 1265834489 in words is "one billion, two hundred sixty-five million, eight hundred thirty-four thousand, four hundred eighty-nine".