851500100 has 72 divisors (see below), whose sum is σ = 2030599200. Its totient is φ = 307353600.

The previous prime is 851500099. The next prime is 851500127. The reversal of 851500100 is 1005158.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150116 + ... + 155684.

Almost surely, 2^851500100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851500100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015299600).

851500100 is an abundant number, since it is smaller than the sum of its proper divisors (1179099100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851500100 is a wasteful number, since it uses less digits than its factorization.

851500100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5733 (or 5726 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 851500100 is about 29180.4746363043. The cubic root of 851500100 is about 947.8251634466.

Adding to 851500100 its reverse (1005158), we get a palindrome (852505258).

The spelling of 851500100 in words is "eight hundred fifty-one million, five hundred thousand, one hundred".