981557149 has 4 divisors (see below), whose sum is σ = 987579136. Its totient is φ = 975535164.

The previous prime is 981557141. The next prime is 981557153. The reversal of 981557149 is 941755189.

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: 941755189 = 4943 ⋅190523.

It is a cyclic number.

It is not a de Polignac number, because 981557149 - 2³ = 981557141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981557141) 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, 3010749 + ... + 3011074.

It is an arithmetic number, because the mean of its divisors is an integer number (246894784).

Almost surely, 2^981557149 is an apocalyptic number.

It is an amenable number.

981557149 is a deficient number, since it is larger than the sum of its proper divisors (6021987).

981557149 is a wasteful number, since it uses less digits than its factorization.

981557149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6021986.

The product of its digits is 453600, while the sum is 49.

The square root of 981557149 is about 31329.8124635306. The cubic root of 981557149 is about 993.8141977487.

The spelling of 981557149 in words is "nine hundred eighty-one million, five hundred fifty-seven thousand, one hundred forty-nine".