265042781 has 2 divisors, whose sum is σ = 265042782. Its totient is φ = 265042780.

The previous prime is 265042769. The next prime is 265042831. The reversal of 265042781 is 187240562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193488100 + 71554681 = 13910^2 + 8459^2 .

It is a cyclic number.

It is not a de Polignac number, because 265042781 - 2¹⁴ = 265026397 is a prime.

It is a super-2 number, since 2×265042781² = 140495351520427922, 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 (265042751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132521390 + 132521391.

It is an arithmetic number, because the mean of its divisors is an integer number (132521391).

Almost surely, 2^265042781 is an apocalyptic number.

It is an amenable number.

265042781 is a deficient number, since it is larger than the sum of its proper divisors (1).

265042781 is an equidigital number, since it uses as much as digits as its factorization.

265042781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 265042781 is about 16280.1345510410. The cubic root of 265042781 is about 642.3503916674.

The spelling of 265042781 in words is "two hundred sixty-five million, forty-two thousand, seven hundred eighty-one".