9534749689921 has 3 divisors (see below), whose sum is σ = 9534752777761. Its totient is φ = 9534746602082.

The previous prime is 9534749689879. The next prime is 9534749689961. The reversal of 9534749689921 is 1299869474359.

The square root of 9534749689921 is 3087839.

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

9534749689921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 9534749689921 - 2⁷ = 9534749689793 is a prime.

It is a super-2 number, since 2×9534749689921² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9534749689961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1543920 + ... + 4631758.

Almost surely, 2^{9534749689921} is an apocalyptic number.

9534749689921 is the 3087839-th square number.

9534749689921 is the 1543920-th centered octagonal number.

It is an amenable number.

9534749689921 is a deficient number, since it is larger than the sum of its proper divisors (3087840).

9534749689921 is an frugal number, since it uses more digits than its factorization.

9534749689921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6175678 (or 3087839 counting only the distinct ones).

The product of its digits is 1058158080, while the sum is 76.

The spelling of 9534749689921 in words is "nine trillion, five hundred thirty-four billion, seven hundred forty-nine million, six hundred eighty-nine thousand, nine hundred twenty-one".