812500001 has 16 divisors (see below), whose sum is σ = 863036544. Its totient is φ = 763323264.

The previous prime is 812499997. The next prime is 812500027. The reversal of 812500001 is 100005218.

It is not a de Polignac number, because 812500001 - 2² = 812499997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (812500301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464210 + ... + 465956.

It is an arithmetic number, because the mean of its divisors is an integer number (53939784).

Almost surely, 2^812500001 is an apocalyptic number.

It is an amenable number.

812500001 is a deficient number, since it is larger than the sum of its proper divisors (50536543).

812500001 is a wasteful number, since it uses less digits than its factorization.

812500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 812500001 is about 28504.3856450196. The cubic root of 812500001 is about 933.1277895871.

Adding to 812500001 its reverse (100005218), we get a palindrome (912505219).

The spelling of 812500001 in words is "eight hundred twelve million, five hundred thousand, one".