811871001 has 12 divisors (see below), whose sum is σ = 1179726912. Its totient is φ = 538005336.

The previous prime is 811870993. The next prime is 811871009. The reversal of 811871001 is 100178118.

It is an interprime number because it is at equal distance from previous prime (811870993) and next prime (811871009).

It is not a de Polignac number, because 811871001 - 2³ = 811870993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (811871009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268581 + ... + 271586.

It is an arithmetic number, because the mean of its divisors is an integer number (98310576).

Almost surely, 2^811871001 is an apocalyptic number.

It is an amenable number.

811871001 is a deficient number, since it is larger than the sum of its proper divisors (367855911).

811871001 is a wasteful number, since it uses less digits than its factorization.

811871001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540340 (or 540337 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 27.

The square root of 811871001 is about 28493.3501189313. The cubic root of 811871001 is about 932.8869326009.

The spelling of 811871001 in words is "eight hundred eleven million, eight hundred seventy-one thousand, one".