9281381 has 4 divisors (see below), whose sum is σ = 9291264. Its totient is φ = 9271500.

The previous prime is 9281323. The next prime is 9281399. The reversal of 9281381 is 1831829.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1831829 = 499 ⋅3671.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9281381 is a prime.

It is a super-2 number, since 2×9281381² = 172288066534322, 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 (9281081) 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, 3365 + ... + 5466.

It is an arithmetic number, because the mean of its divisors is an integer number (2322816).

Almost surely, 2^9281381 is an apocalyptic number.

It is an amenable number.

9281381 is a deficient number, since it is larger than the sum of its proper divisors (9883).

9281381 is a wasteful number, since it uses less digits than its factorization.

9281381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9882.

The product of its digits is 3456, while the sum is 32.

The square root of 9281381 is about 3046.5359016430. The cubic root of 9281381 is about 210.1539385276.

The spelling of 9281381 in words is "nine million, two hundred eighty-one thousand, three hundred eighty-one".