261682769 has 2 divisors, whose sum is σ = 261682770. Its totient is φ = 261682768.

The previous prime is 261682723. The next prime is 261682777. The reversal of 261682769 is 967286162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172134400 + 89548369 = 13120^2 + 9463^2 .

It is a cyclic number.

It is not a de Polignac number, because 261682769 - 2¹² = 261678673 is a prime.

It is a super-2 number, since 2×261682769² = 136955743183014722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261682789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130841384 + 130841385.

It is an arithmetic number, because the mean of its divisors is an integer number (130841385).

Almost surely, 2^261682769 is an apocalyptic number.

It is an amenable number.

261682769 is a deficient number, since it is larger than the sum of its proper divisors (1).

261682769 is an equidigital number, since it uses as much as digits as its factorization.

261682769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 261682769 is about 16176.6117898650. The cubic root of 261682769 is about 639.6244288981.

The spelling of 261682769 in words is "two hundred sixty-one million, six hundred eighty-two thousand, seven hundred sixty-nine".