981427489 has 4 divisors (see below), whose sum is σ = 1121631424. Its totient is φ = 841223556.

The previous prime is 981427477. The next prime is 981427523. The reversal of 981427489 is 984724189.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 981427489 - 2¹¹ = 981425441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981427429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70101957 + ... + 70101970.

It is an arithmetic number, because the mean of its divisors is an integer number (280407856).

Almost surely, 2^981427489 is an apocalyptic number.

It is an amenable number.

981427489 is a deficient number, since it is larger than the sum of its proper divisors (140203935).

981427489 is a wasteful number, since it uses less digits than its factorization.

981427489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140203934.

The product of its digits is 1161216, while the sum is 52.

The square root of 981427489 is about 31327.7431201164. The cubic root of 981427489 is about 993.7704361184.

The spelling of 981427489 in words is "nine hundred eighty-one million, four hundred twenty-seven thousand, four hundred eighty-nine".