1263782257 has 2 divisors, whose sum is σ = 1263782258. Its totient is φ = 1263782256.

The previous prime is 1263782231. The next prime is 1263782279. The reversal of 1263782257 is 7522873621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1197782881 + 65999376 = 34609^2 + 8124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263782257 - 2⁷ = 1263782129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263782557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631891128 + 631891129.

It is an arithmetic number, because the mean of its divisors is an integer number (631891129).

Almost surely, 2^1263782257 is an apocalyptic number.

It is an amenable number.

1263782257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263782257 is an equidigital number, since it uses as much as digits as its factorization.

1263782257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 43.

The square root of 1263782257 is about 35549.7152871862. The cubic root of 1263782257 is about 1081.1619458871.

The spelling of 1263782257 in words is "one billion, two hundred sixty-three million, seven hundred eighty-two thousand, two hundred fifty-seven".