994356981 has 24 divisors (see below), whose sum is σ = 1476980960. Its totient is φ = 644171616.

The previous prime is 994356971. The next prime is 994356989. The reversal of 994356981 is 189653499.

It is not a de Polignac number, because 994356981 - 2⁵ = 994356949 is a prime.

It is a super-2 number, since 2×994356981² = 1977491611326868722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (994356989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 372630 + ... + 375288.

Almost surely, 2^994356981 is an apocalyptic number.

It is an amenable number.

994356981 is a deficient number, since it is larger than the sum of its proper divisors (482623979).

994356981 is a wasteful number, since it uses less digits than its factorization.

994356981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825 (or 3822 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 994356981 is about 31533.4264075441. The cubic root of 994356981 is about 998.1154443477.

The spelling of 994356981 in words is "nine hundred ninety-four million, three hundred fifty-six thousand, nine hundred eighty-one".