981481555 has 4 divisors (see below), whose sum is σ = 1177777872. Its totient is φ = 785185240.

The previous prime is 981481477. The next prime is 981481559. The reversal of 981481555 is 555184189.

It is a happy number.

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

It is not a de Polignac number, because 981481555 - 2¹¹ = 981479507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981481559) 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, 98148151 + ... + 98148160.

It is an arithmetic number, because the mean of its divisors is an integer number (294444468).

Almost surely, 2^981481555 is an apocalyptic number.

981481555 is a deficient number, since it is larger than the sum of its proper divisors (196296317).

981481555 is a wasteful number, since it uses less digits than its factorization.

981481555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196296316.

The product of its digits is 288000, while the sum is 46.

The square root of 981481555 is about 31328.6060175042. The cubic root of 981481555 is about 993.7886844374.

The spelling of 981481555 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, five hundred fifty-five".