981550506 has 16 divisors (see below), whose sum is σ = 1963705248. Its totient is φ = 327082800.

The previous prime is 981550499. The next prime is 981550523. The reversal of 981550506 is 605055189.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2485 + ... + 44376.

It is an arithmetic number, because the mean of its divisors is an integer number (122731578).

Almost surely, 2^981550506 is an apocalyptic number.

981550506 is an abundant number, since it is smaller than the sum of its proper divisors (982154742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981550506 is a wasteful number, since it uses less digits than its factorization.

981550506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50357.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 981550506 is about 31329.7064461192. The cubic root of 981550506 is about 993.8119557591.

The spelling of 981550506 in words is "nine hundred eighty-one million, five hundred fifty thousand, five hundred six".