981555193 has 4 divisors (see below), whose sum is σ = 987577168. Its totient is φ = 975533220.

The previous prime is 981555173. The next prime is 981555221. The reversal of 981555193 is 391555189.

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, and also an emirpimes, since its reverse is a distinct semiprime: 391555189 = 263 ⋅1488803.

It is a cyclic number.

It is not a de Polignac number, because 981555193 - 2⁵ = 981555161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981555173) 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, 3010743 + ... + 3011068.

It is an arithmetic number, because the mean of its divisors is an integer number (246894292).

Almost surely, 2^981555193 is an apocalyptic number.

It is an amenable number.

981555193 is a deficient number, since it is larger than the sum of its proper divisors (6021975).

981555193 is a wasteful number, since it uses less digits than its factorization.

981555193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6021974.

The product of its digits is 243000, while the sum is 46.

The square root of 981555193 is about 31329.7812472414. The cubic root of 981555193 is about 993.8135376065.

The spelling of 981555193 in words is "nine hundred eighty-one million, five hundred fifty-five thousand, one hundred ninety-three".