265988381 has 2 divisors, whose sum is σ = 265988382. Its totient is φ = 265988380.

The previous prime is 265988347. The next prime is 265988413. The reversal of 265988381 is 183889562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265983481 + 4900 = 16309^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 265988381 - 2¹⁰ = 265987357 is a prime.

It is a super-2 number, since 2×265988381² = 141499637654002322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265988311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132994190 + 132994191.

It is an arithmetic number, because the mean of its divisors is an integer number (132994191).

Almost surely, 2^265988381 is an apocalyptic number.

It is an amenable number.

265988381 is a deficient number, since it is larger than the sum of its proper divisors (1).

265988381 is an equidigital number, since it uses as much as digits as its factorization.

265988381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The square root of 265988381 is about 16309.1502231110. The cubic root of 265988381 is about 643.1133950375.

The spelling of 265988381 in words is "two hundred sixty-five million, nine hundred eighty-eight thousand, three hundred eighty-one".