981693085 has 4 divisors (see below), whose sum is σ = 1178031708. Its totient is φ = 785354464.

The previous prime is 981693077. The next prime is 981693113. The reversal of 981693085 is 580396189.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 306005049 + 675688036 = 17493^2 + 25994^2 .

It is a cyclic number.

It is not a de Polignac number, because 981693085 - 2³ = 981693077 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98169304 + ... + 98169313.

It is an arithmetic number, because the mean of its divisors is an integer number (294507927).

Almost surely, 2^981693085 is an apocalyptic number.

It is an amenable number.

981693085 is a deficient number, since it is larger than the sum of its proper divisors (196338623).

981693085 is a wasteful number, since it uses less digits than its factorization.

981693085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196338622.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 981693085 is about 31331.9818236894. The cubic root of 981693085 is about 993.8600734578.

The spelling of 981693085 in words is "nine hundred eighty-one million, six hundred ninety-three thousand, eighty-five".