7969831501921 has 9 divisors (see below), whose sum is σ = 8331479636529. Its totient is φ = 7623254980836.

The previous prime is 7969831501897. The next prime is 7969831501939. The reversal of 7969831501921 is 1291051389697.

The square root of 7969831501921 is 2823089.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 7969831501921 - 2²⁷ = 7969697284193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7969831501921.

It is not an unprimeable number, because it can be changed into a prime (7969831591921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 64869676 + ... + 64992418.

Almost surely, 2^{7969831501921} is an apocalyptic number.

7969831501921 is the 2823089-th square number.

7969831501921 is the 1411545-th centered octagonal number.

It is an amenable number.

7969831501921 is a deficient number, since it is larger than the sum of its proper divisors (361648134608).

7969831501921 is an frugal number, since it uses more digits than its factorization.

7969831501921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245532 (or 122766 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 61.

The spelling of 7969831501921 in words is "seven trillion, nine hundred sixty-nine billion, eight hundred thirty-one million, five hundred one thousand, nine hundred twenty-one".