981611893 has 4 divisors (see below), whose sum is σ = 994037440. Its totient is φ = 969186348.

The previous prime is 981611837. The next prime is 981611921. The reversal of 981611893 is 398116189.

It is a happy number.

981611893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 398116189 = 37 ⋅10759897.

It is a cyclic number.

It is not a de Polignac number, because 981611893 - 2¹⁷ = 981480821 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 (981611803) 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, 6212655 + ... + 6212812.

It is an arithmetic number, because the mean of its divisors is an integer number (248509360).

Almost surely, 2^981611893 is an apocalyptic number.

It is an amenable number.

981611893 is a deficient number, since it is larger than the sum of its proper divisors (12425547).

981611893 is a wasteful number, since it uses less digits than its factorization.

981611893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12425546.

The product of its digits is 93312, while the sum is 46.

The square root of 981611893 is about 31330.6861239903. The cubic root of 981611893 is about 993.8326732744.

The spelling of 981611893 in words is "nine hundred eighty-one million, six hundred eleven thousand, eight hundred ninety-three".