9481281491 has 4 divisors (see below), whose sum is σ = 10343216184. Its totient is φ = 8619346800.

The previous prime is 9481281479. The next prime is 9481281493. The reversal of 9481281491 is 1941821849.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941821849 = 11 ⋅176529259.

It is a cyclic number.

It is not a de Polignac number, because 9481281491 - 2¹⁸ = 9481019347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9481281493) 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, 430967330 + ... + 430967351.

It is an arithmetic number, because the mean of its divisors is an integer number (2585804046).

Almost surely, 2^9481281491 is an apocalyptic number.

9481281491 is a deficient number, since it is larger than the sum of its proper divisors (861934693).

9481281491 is a wasteful number, since it uses less digits than its factorization.

9481281491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861934692.

The product of its digits is 165888, while the sum is 47.

The square root of 9481281491 is about 97371.8721756956. The cubic root of 9481281491 is about 2116.5198546764.

The spelling of 9481281491 in words is "nine billion, four hundred eighty-one million, two hundred eighty-one thousand, four hundred ninety-one".