981427555 has 4 divisors (see below), whose sum is σ = 1177713072. Its totient is φ = 785142040.

The previous prime is 981427547. The next prime is 981427583. The reversal of 981427555 is 555724189.

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

It is not a de Polignac number, because 981427555 - 2³ = 981427547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98142751 + ... + 98142760.

It is an arithmetic number, because the mean of its divisors is an integer number (294428268).

Almost surely, 2^981427555 is an apocalyptic number.

981427555 is a deficient number, since it is larger than the sum of its proper divisors (196285517).

981427555 is a wasteful number, since it uses less digits than its factorization.

981427555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196285516.

The product of its digits is 504000, while the sum is 46.

The square root of 981427555 is about 31327.7441734958. The cubic root of 981427555 is about 993.7704583951.

The spelling of 981427555 in words is "nine hundred eighty-one million, four hundred twenty-seven thousand, five hundred fifty-five".