1285001871 has 4 divisors (see below), whose sum is σ = 1713335832. Its totient is φ = 856667912.

The previous prime is 1285001867. The next prime is 1285001873. The reversal of 1285001871 is 1781005821.

1285001871 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1285001871 - 2² = 1285001867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285001873) 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, 214166976 + ... + 214166981.

It is an arithmetic number, because the mean of its divisors is an integer number (428333958).

Almost surely, 2^1285001871 is an apocalyptic number.

1285001871 is a deficient number, since it is larger than the sum of its proper divisors (428333961).

1285001871 is an equidigital number, since it uses as much as digits as its factorization.

1285001871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428333960.

The product of its (nonzero) digits is 4480, while the sum is 33.

The square root of 1285001871 is about 35846.9227549590. The cubic root of 1285001871 is about 1087.1794966207.

The spelling of 1285001871 in words is "one billion, two hundred eighty-five million, one thousand, eight hundred seventy-one".