265033981 has 2 divisors, whose sum is σ = 265033982. Its totient is φ = 265033980.

The previous prime is 265033943. The next prime is 265034039. The reversal of 265033981 is 189330562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159643225 + 105390756 = 12635^2 + 10266^2 .

It is a cyclic number.

It is not a de Polignac number, because 265033981 - 2¹¹ = 265031933 is a prime.

It is a super-2 number, since 2×265033981² = 140486022169416722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 265033981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265033921) 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, 132516990 + 132516991.

It is an arithmetic number, because the mean of its divisors is an integer number (132516991).

Almost surely, 2^265033981 is an apocalyptic number.

It is an amenable number.

265033981 is a deficient number, since it is larger than the sum of its proper divisors (1).

265033981 is an equidigital number, since it uses as much as digits as its factorization.

265033981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 265033981 is about 16279.8642807611. The cubic root of 265033981 is about 642.3432824428.

The spelling of 265033981 in words is "two hundred sixty-five million, thirty-three thousand, nine hundred eighty-one".