264790781 has 2 divisors, whose sum is σ = 264790782. Its totient is φ = 264790780.

The previous prime is 264790763. The next prime is 264790787. The reversal of 264790781 is 187097462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241180900 + 23609881 = 15530^2 + 4859^2 .

It is a cyclic number.

It is not a de Polignac number, because 264790781 - 2¹⁴ = 264774397 is a prime.

It is a super-2 number, since 2×264790781² = 140228315405179922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264790787) 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, 132395390 + 132395391.

It is an arithmetic number, because the mean of its divisors is an integer number (132395391).

Almost surely, 2^264790781 is an apocalyptic number.

It is an amenable number.

264790781 is a deficient number, since it is larger than the sum of its proper divisors (1).

264790781 is an equidigital number, since it uses as much as digits as its factorization.

264790781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 264790781 is about 16272.3932167337. The cubic root of 264790781 is about 642.1467470239.

The spelling of 264790781 in words is "two hundred sixty-four million, seven hundred ninety thousand, seven hundred eighty-one".