981775493 has 4 divisors (see below), whose sum is σ = 1024461408. Its totient is φ = 939089580.

The previous prime is 981775477. The next prime is 981775499. The reversal of 981775493 is 394577189.

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.

It is a cyclic number.

It is not a de Polignac number, because 981775493 - 2⁴ = 981775477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981775499) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21342923 + ... + 21342968.

It is an arithmetic number, because the mean of its divisors is an integer number (256115352).

Almost surely, 2^981775493 is an apocalyptic number.

It is an amenable number.

981775493 is a deficient number, since it is larger than the sum of its proper divisors (42685915).

981775493 is a wasteful number, since it uses less digits than its factorization.

981775493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42685914.

The product of its digits is 1905120, while the sum is 53.

The square root of 981775493 is about 31333.2968740923. The cubic root of 981775493 is about 993.8878824647.

The spelling of 981775493 in words is "nine hundred eighty-one million, seven hundred seventy-five thousand, four hundred ninety-three".