6987211917 has 16 divisors (see below), whose sum is σ = 10651998720. Its totient is φ = 3990885552.

The previous prime is 6987211909. The next prime is 6987211919. The reversal of 6987211917 is 7191127896.

It is a happy number.

It is not a de Polignac number, because 6987211917 - 2³ = 6987211909 is a prime.

It is a super-2 number, since 2×6987211917² = 97642260746133629778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6987211917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6987211919) 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, 27067 + ... + 121272.

It is an arithmetic number, because the mean of its divisors is an integer number (665749920).

Almost surely, 2^6987211917 is an apocalyptic number.

It is an amenable number.

6987211917 is a deficient number, since it is larger than the sum of its proper divisors (3664786803).

6987211917 is a wasteful number, since it uses less digits than its factorization.

6987211917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150592.

The product of its digits is 381024, while the sum is 51.

The square root of 6987211917 is about 83589.5443042968. The cubic root of 6987211917 is about 1911.7655811245.

The spelling of 6987211917 in words is "six billion, nine hundred eighty-seven million, two hundred eleven thousand, nine hundred seventeen".