1187867691 has 12 divisors (see below), whose sum is σ = 1716143520. Its totient is φ = 791757360.

The previous prime is 1187867677. The next prime is 1187867693. The reversal of 1187867691 is 1967687811.

1187867691 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1187867691 - 2⁷ = 1187867563 is a prime.

It is a super-2 number, since 2×1187867691² = 2822059302643342962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1187867693) 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, 54286 + ... + 72956.

It is an arithmetic number, because the mean of its divisors is an integer number (143011960).

Almost surely, 2^1187867691 is an apocalyptic number.

1187867691 is a deficient number, since it is larger than the sum of its proper divisors (528275829).

1187867691 is a wasteful number, since it uses less digits than its factorization.

1187867691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25746 (or 25743 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 1187867691 is about 34465.4564890703. The cubic root of 1187867691 is about 1059.0651812208.

The spelling of 1187867691 in words is "one billion, one hundred eighty-seven million, eight hundred sixty-seven thousand, six hundred ninety-one".