7691111981 has 8 divisors (see below), whose sum is σ = 8969227200. Its totient is φ = 6592381404.

The previous prime is 7691111971. The next prime is 7691111993. The reversal of 7691111981 is 1891111967.

It is not a de Polignac number, because 7691111981 - 2¹⁰ = 7691110957 is a prime.

It is a super-2 number, since 2×7691111981² (a number of 21 digits) contains 22 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 (7691111921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11211191 + ... + 11211876.

It is an arithmetic number, because the mean of its divisors is an integer number (1121153400).

Almost surely, 2^7691111981 is an apocalyptic number.

It is an amenable number.

7691111981 is a deficient number, since it is larger than the sum of its proper divisors (1278115219).

7691111981 is an equidigital number, since it uses as much as digits as its factorization.

7691111981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22423088 (or 22423074 counting only the distinct ones).

The product of its digits is 27216, while the sum is 44.

The square root of 7691111981 is about 87698.9850625422. The cubic root of 7691111981 is about 1973.9207461097.

The spelling of 7691111981 in words is "seven billion, six hundred ninety-one million, one hundred eleven thousand, nine hundred eighty-one".