1285210243 has 2 divisors, whose sum is σ = 1285210244. Its totient is φ = 1285210242.

The previous prime is 1285210237. The next prime is 1285210279. The reversal of 1285210243 is 3420125821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1285210243 - 2⁵ = 1285210211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285210643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642605121 + 642605122.

It is an arithmetic number, because the mean of its divisors is an integer number (642605122).

Almost surely, 2^1285210243 is an apocalyptic number.

1285210243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285210243 is an equidigital number, since it uses as much as digits as its factorization.

1285210243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1285210243 is about 35849.8290511963. The cubic root of 1285210243 is about 1087.2382580195.

The spelling of 1285210243 in words is "one billion, two hundred eighty-five million, two hundred ten thousand, two hundred forty-three".