265138997 has 2 divisors, whose sum is σ = 265138998. Its totient is φ = 265138996.

The previous prime is 265138957. The next prime is 265139011. The reversal of 265138997 is 799831562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217887121 + 47251876 = 14761^2 + 6874^2 .

It is a cyclic number.

It is not a de Polignac number, because 265138997 - 2¹⁰ = 265137973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265138957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132569498 + 132569499.

It is an arithmetic number, because the mean of its divisors is an integer number (132569499).

Almost surely, 2^265138997 is an apocalyptic number.

It is an amenable number.

265138997 is a deficient number, since it is larger than the sum of its proper divisors (1).

265138997 is an equidigital number, since it uses as much as digits as its factorization.

265138997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 50.

The square root of 265138997 is about 16283.0892953395. The cubic root of 265138997 is about 642.4281110804.

The spelling of 265138997 in words is "two hundred sixty-five million, one hundred thirty-eight thousand, nine hundred ninety-seven".