691084111861 has 24 divisors (see below), whose sum is σ = 821931219872. Its totient is φ = 577181959200.

The previous prime is 691084111859. The next prime is 691084111873. The reversal of 691084111861 is 168111480196.

It is a happy number.

It is not a de Polignac number, because 691084111861 - 2¹ = 691084111859 is a prime.

It is a super-3 number, since 3×691084111861³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691084111811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 709191 + ... + 1372996.

Almost surely, 2^691084111861 is an apocalyptic number.

It is an amenable number.

691084111861 is a deficient number, since it is larger than the sum of its proper divisors (130847108011).

691084111861 is a wasteful number, since it uses less digits than its factorization.

691084111861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082433 (or 2082422 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 691084111861 in words is "six hundred ninety-one billion, eighty-four million, one hundred eleven thousand, eight hundred sixty-one".