993197081 has 4 divisors (see below), whose sum is σ = 994502964. Its totient is φ = 991891200.

The previous prime is 993197041. The next prime is 993197083. The reversal of 993197081 is 180791399.

It is a happy number.

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 39375625 + 953821456 = 6275^2 + 30884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-993197081 is a prime.

It is a super-2 number, since 2×993197081² = 1972880883413841122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (993197083) 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, 651800 + ... + 653321.

It is an arithmetic number, because the mean of its divisors is an integer number (248625741).

Almost surely, 2^993197081 is an apocalyptic number.

It is an amenable number.

993197081 is a deficient number, since it is larger than the sum of its proper divisors (1305883).

993197081 is a wasteful number, since it uses less digits than its factorization.

993197081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305882.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 993197081 is about 31515.0294462817. The cubic root of 993197081 is about 997.7271986207.

The spelling of 993197081 in words is "nine hundred ninety-three million, one hundred ninety-seven thousand, eighty-one".