1069781257 has 2 divisors, whose sum is σ = 1069781258. Its totient is φ = 1069781256.

The previous prime is 1069781233. The next prime is 1069781291. The reversal of 1069781257 is 7521879601.

It is a happy number.

1069781257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847741456 + 222039801 = 29116^2 + 14901^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1069781257 is a prime.

It is a super-2 number, since 2×1069781257² = 2288863875657000098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1069782257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534890628 + 534890629.

It is an arithmetic number, because the mean of its divisors is an integer number (534890629).

Almost surely, 2^1069781257 is an apocalyptic number.

It is an amenable number.

1069781257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1069781257 is an equidigital number, since it uses as much as digits as its factorization.

1069781257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 1069781257 is about 32707.5107123731. The cubic root of 1069781257 is about 1022.7394184726.

The spelling of 1069781257 in words is "one billion, sixty-nine million, seven hundred eighty-one thousand, two hundred fifty-seven".