9547991243 has 4 divisors (see below), whose sum is σ = 10911990000. Its totient is φ = 8183992488.

The previous prime is 9547991221. The next prime is 9547991263. The reversal of 9547991243 is 3421997459.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9547991243 - 2¹² = 9547987147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9547991213) 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, 681999368 + ... + 681999381.

It is an arithmetic number, because the mean of its divisors is an integer number (2727997500).

Almost surely, 2^9547991243 is an apocalyptic number.

9547991243 is a deficient number, since it is larger than the sum of its proper divisors (1363998757).

9547991243 is a wasteful number, since it uses less digits than its factorization.

9547991243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363998756.

The product of its digits is 2449440, while the sum is 53.

The square root of 9547991243 is about 97713.8231930365. The cubic root of 9547991243 is about 2121.4721621001.

The spelling of 9547991243 in words is "nine billion, five hundred forty-seven million, nine hundred ninety-one thousand, two hundred forty-three".