993942991 has 8 divisors (see below), whose sum is σ = 1053785600. Its totient is φ = 934853400.

The previous prime is 993942949. The next prime is 993943007. The reversal of 993942991 is 199249399.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 993942991 - 2¹¹ = 993940943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993942091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185535 + ... + 190816.

It is an arithmetic number, because the mean of its divisors is an integer number (131723200).

Almost surely, 2^993942991 is an apocalyptic number.

993942991 is a deficient number, since it is larger than the sum of its proper divisors (59842609).

993942991 is a wasteful number, since it uses less digits than its factorization.

993942991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376509.

The product of its digits is 1417176, while the sum is 55.

The square root of 993942991 is about 31526.8614200653. The cubic root of 993942991 is about 997.9769068542.

The spelling of 993942991 in words is "nine hundred ninety-three million, nine hundred forty-two thousand, nine hundred ninety-one".