6991124761 has 8 divisors (see below), whose sum is σ = 7406670024. Its totient is φ = 6576057600.

The previous prime is 6991124753. The next prime is 6991124773. The reversal of 6991124761 is 1674211996.

It can be written as a sum of positive squares in 4 ways, for example, as 1847366361 + 5143758400 = 42981^2 + 71720^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6991124761 - 2³ = 6991124753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6991124711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89190 + ... + 148111.

It is an arithmetic number, because the mean of its divisors is an integer number (925833753).

Almost surely, 2^6991124761 is an apocalyptic number.

It is an amenable number.

6991124761 is a deficient number, since it is larger than the sum of its proper divisors (415545263).

6991124761 is a wasteful number, since it uses less digits than its factorization.

6991124761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239051.

The product of its digits is 163296, while the sum is 46.

The square root of 6991124761 is about 83612.9461327610. The cubic root of 6991124761 is about 1912.1223779249.

The spelling of 6991124761 in words is "six billion, nine hundred ninety-one million, one hundred twenty-four thousand, seven hundred sixty-one".