985401871 has 4 divisors (see below), whose sum is σ = 1012034392. Its totient is φ = 958769352.

The previous prime is 985401863. The next prime is 985401877. The reversal of 985401871 is 178104589.

It is a happy number.

985401871 is digitally balanced in base 2, 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 985401871 - 2³ = 985401863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985401877) 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, 13316205 + ... + 13316278.

It is an arithmetic number, because the mean of its divisors is an integer number (253008598).

Almost surely, 2^985401871 is an apocalyptic number.

985401871 is a deficient number, since it is larger than the sum of its proper divisors (26632521).

985401871 is a wasteful number, since it uses less digits than its factorization.

985401871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26632520.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 985401871 is about 31391.1113374471. Note that the first 3 decimals coincide. The cubic root of 985401871 is about 995.1100847031.

The spelling of 985401871 in words is "nine hundred eighty-five million, four hundred one thousand, eight hundred seventy-one".