6991131019 has 8 divisors (see below), whose sum is σ = 7251174288. Its totient is φ = 6734829600.

The previous prime is 6991130999. The next prime is 6991131041. The reversal of 6991131019 is 9101311996.

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 6991131019 - 2⁵ = 6991130987 is a prime.

It is a super-2 number, since 2×6991131019² = 97751825849647956722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6991131079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931657 + ... + 939130.

It is an arithmetic number, because the mean of its divisors is an integer number (906396786).

Almost surely, 2^6991131019 is an apocalyptic number.

6991131019 is a deficient number, since it is larger than the sum of its proper divisors (260043269).

6991131019 is a wasteful number, since it uses less digits than its factorization.

6991131019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870925.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 6991131019 is about 83612.9835551872. The cubic root of 6991131019 is about 1912.1229484606.

The spelling of 6991131019 in words is "six billion, nine hundred ninety-one million, one hundred thirty-one thousand, nineteen".