265531397 has 2 divisors, whose sum is σ = 265531398. Its totient is φ = 265531396.

The previous prime is 265531379. The next prime is 265531417. The reversal of 265531397 is 793135562.

It is a happy number.

265531397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (265531379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188073796 + 77457601 = 13714^2 + 8801^2 .

It is a cyclic number.

It is not a de Polignac number, because 265531397 - 2⁶ = 265531333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265531697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132765698 + 132765699.

It is an arithmetic number, because the mean of its divisors is an integer number (132765699).

Almost surely, 2^265531397 is an apocalyptic number.

It is an amenable number.

265531397 is a deficient number, since it is larger than the sum of its proper divisors (1).

265531397 is an equidigital number, since it uses as much as digits as its factorization.

265531397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 41.

The square root of 265531397 is about 16295.1341510280. The cubic root of 265531397 is about 642.7448814459.

The spelling of 265531397 in words is "two hundred sixty-five million, five hundred thirty-one thousand, three hundred ninety-seven".