8210971491 has 16 divisors (see below), whose sum is σ = 11596722048. Its totient is φ = 5149865600.

The previous prime is 8210971481. The next prime is 8210971507. The reversal of 8210971491 is 1941790128.

It is a cyclic number.

It is not a de Polignac number, because 8210971491 - 2²⁶ = 8143862627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8210971421) 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, 97276 + ... + 160886.

It is an arithmetic number, because the mean of its divisors is an integer number (724795128).

Almost surely, 2^8210971491 is an apocalyptic number.

8210971491 is a deficient number, since it is larger than the sum of its proper divisors (3385750557).

8210971491 is a wasteful number, since it uses less digits than its factorization.

8210971491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66162.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 8210971491 is about 90614.4110558580. The cubic root of 8210971491 is about 2017.4286377041.

The spelling of 8210971491 in words is "eight billion, two hundred ten million, nine hundred seventy-one thousand, four hundred ninety-one".