1265140273 has 2 divisors, whose sum is σ = 1265140274. Its totient is φ = 1265140272.

The previous prime is 1265140271. The next prime is 1265140301. The reversal of 1265140273 is 3720415621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108690209 + 156450064 = 33297^2 + 12508^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265140273 - 2¹ = 1265140271 is a prime.

Together with 1265140271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1265140271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632570136 + 632570137.

It is an arithmetic number, because the mean of its divisors is an integer number (632570137).

Almost surely, 2^1265140273 is an apocalyptic number.

It is an amenable number.

1265140273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265140273 is an equidigital number, since it uses as much as digits as its factorization.

1265140273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1265140273 is about 35568.8103961884. The cubic root of 1265140273 is about 1081.5490668019.

Adding to 1265140273 its reverse (3720415621), we get a palindrome (4985555894).

The spelling of 1265140273 in words is "one billion, two hundred sixty-five million, one hundred forty thousand, two hundred seventy-three".