7691993521 has 4 divisors (see below), whose sum is σ = 7692424000. Its totient is φ = 7691563044.

The previous prime is 7691993503. The next prime is 7691993531. The reversal of 7691993521 is 1253991967.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7691993521 - 2¹⁵ = 7691960753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7691993531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187221 + ... + 224578.

It is an arithmetic number, because the mean of its divisors is an integer number (1923106000).

Almost surely, 2^7691993521 is an apocalyptic number.

It is an amenable number.

7691993521 is a deficient number, since it is larger than the sum of its proper divisors (430479).

7691993521 is a wasteful number, since it uses less digits than its factorization.

7691993521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430478.

The product of its digits is 918540, while the sum is 52.

The square root of 7691993521 is about 87704.0108603934. The cubic root of 7691993521 is about 1973.9961588554.

The spelling of 7691993521 in words is "seven billion, six hundred ninety-one million, nine hundred ninety-three thousand, five hundred twenty-one".