9543981 has 4 divisors (see below), whose sum is σ = 12725312. Its totient is φ = 6362652.

The previous prime is 9543901. The next prime is 9543983. The reversal of 9543981 is 1893459.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1893459 = 3 ⋅631153.

It is not a de Polignac number, because 9543981 - 2²³ = 1155373 is a prime.

It is a super-2 number, since 2×9543981² = 182175146656722, which 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 (9543983) 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, 1590661 + ... + 1590666.

It is an arithmetic number, because the mean of its divisors is an integer number (3181328).

Almost surely, 2^9543981 is an apocalyptic number.

It is an amenable number.

9543981 is a deficient number, since it is larger than the sum of its proper divisors (3181331).

9543981 is a wasteful number, since it uses less digits than its factorization.

9543981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3181330.

The product of its digits is 38880, while the sum is 39.

The square root of 9543981 is about 3089.3334232485. Note that the first 3 decimals coincide. The cubic root of 9543981 is about 212.1175107985.

The spelling of 9543981 in words is "nine million, five hundred forty-three thousand, nine hundred eighty-one".