1285200001 has 4 divisors (see below), whose sum is σ = 1285846852. Its totient is φ = 1284553152.

The previous prime is 1285199999. The next prime is 1285200019. The reversal of 1285200001 is 1000025821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 526748401 + 758451600 = 22951^2 + 27540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285200001 - 2¹ = 1285199999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285200031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320436 + ... + 324421.

It is an arithmetic number, because the mean of its divisors is an integer number (321461713).

Almost surely, 2^1285200001 is an apocalyptic number.

It is an amenable number.

1285200001 is a deficient number, since it is larger than the sum of its proper divisors (646851).

1285200001 is an equidigital number, since it uses as much as digits as its factorization.

1285200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646850.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1285200001 is about 35849.6862050423. The cubic root of 1285200001 is about 1087.2353698996.

Adding to 1285200001 its reverse (1000025821), we get a palindrome (2285225822).

The spelling of 1285200001 in words is "one billion, two hundred eighty-five million, two hundred thousand, one".