994943881 has 2 divisors, whose sum is σ = 994943882. Its totient is φ = 994943880.

The previous prime is 994943879. The next prime is 994943897. The reversal of 994943881 is 188349499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676000000 + 318943881 = 26000^2 + 17859^2 .

It is a cyclic number.

It is not a de Polignac number, because 994943881 - 2¹ = 994943879 is a prime.

It is a super-2 number, since 2×994943881² = 1979826652678684322, which contains 22 as substring.

Together with 994943879, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (994343881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497471940 + 497471941.

It is an arithmetic number, because the mean of its divisors is an integer number (497471941).

Almost surely, 2^994943881 is an apocalyptic number.

It is an amenable number.

994943881 is a deficient number, since it is larger than the sum of its proper divisors (1).

994943881 is an equidigital number, since it uses as much as digits as its factorization.

994943881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 55.

The square root of 994943881 is about 31542.7310326801. The cubic root of 994943881 is about 998.3117785121.

The spelling of 994943881 in words is "nine hundred ninety-four million, nine hundred forty-three thousand, eight hundred eighty-one".