1265302081 has 2 divisors, whose sum is σ = 1265302082. Its totient is φ = 1265302080.

The previous prime is 1265302079. The next prime is 1265302109. The reversal of 1265302081 is 1802035621.

It is an a-pointer prime, because the next prime (1265302109) can be obtained adding 1265302081 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1257411600 + 7890481 = 35460^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265302081 - 2¹ = 1265302079 is a prime.

It is a super-4 number, since 4×1265302081⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 1265302079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1265302001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632651040 + 632651041.

It is an arithmetic number, because the mean of its divisors is an integer number (632651041).

Almost surely, 2^1265302081 is an apocalyptic number.

It is an amenable number.

1265302081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265302081 is an equidigital number, since it uses as much as digits as its factorization.

1265302081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1265302081 is about 35571.0849005200. The cubic root of 1265302081 is about 1081.5951738976.

The spelling of 1265302081 in words is "one billion, two hundred sixty-five million, three hundred two thousand, eighty-one".