851020025 has 12 divisors (see below), whose sum is σ = 1062971772. Its totient is φ = 675843840.

The previous prime is 851020019. The next prime is 851020039. The reversal of 851020025 is 520020158.

It can be written as a sum of positive squares in 6 ways, for example, as 15578809 + 835441216 = 3947^2 + 28904^2 .

It is not a de Polignac number, because 851020025 - 2¹² = 851015929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120812 + ... + 127661.

It is an arithmetic number, because the mean of its divisors is an integer number (88580981).

Almost surely, 2^851020025 is an apocalyptic number.

It is an amenable number.

851020025 is a deficient number, since it is larger than the sum of its proper divisors (211951747).

851020025 is a wasteful number, since it uses less digits than its factorization.

851020025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248620 (or 248615 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 851020025 is about 29172.2475136901. The cubic root of 851020025 is about 947.6470022983.

The spelling of 851020025 in words is "eight hundred fifty-one million, twenty thousand, twenty-five".