1285851241 has 2 divisors, whose sum is σ = 1285851242. Its totient is φ = 1285851240.

The previous prime is 1285851209. The next prime is 1285851247. The reversal of 1285851241 is 1421585821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228152025 + 57699216 = 35045^2 + 7596^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285851241 - 2⁵ = 1285851209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285851241.

It is not a weakly prime, because it can be changed into another prime (1285851247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642925620 + 642925621.

It is an arithmetic number, because the mean of its divisors is an integer number (642925621).

Almost surely, 2^1285851241 is an apocalyptic number.

It is an amenable number.

1285851241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285851241 is an equidigital number, since it uses as much as digits as its factorization.

1285851241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 37.

The square root of 1285851241 is about 35858.7679793938. The cubic root of 1285851241 is about 1087.4189811664.

The spelling of 1285851241 in words is "one billion, two hundred eighty-five million, eight hundred fifty-one thousand, two hundred forty-one".