981481549 has 4 divisors (see below), whose sum is σ = 981560736. Its totient is φ = 981402364.

The previous prime is 981481477. The next prime is 981481559. The reversal of 981481549 is 945184189.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 981481549 - 2⁹ = 981481037 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 (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, 16519 + ... + 47284.

It is an arithmetic number, because the mean of its divisors is an integer number (245390184).

Almost surely, 2^981481549 is an apocalyptic number.

It is an amenable number.

981481549 is a deficient number, since it is larger than the sum of its proper divisors (79187).

981481549 is a wasteful number, since it uses less digits than its factorization.

981481549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79186.

The product of its digits is 414720, while the sum is 49.

The square root of 981481549 is about 31328.6059217451. The cubic root of 981481549 is about 993.7886824123.

The spelling of 981481549 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, five hundred forty-nine".