943673981 has 4 divisors (see below), whose sum is σ = 952493472. Its totient is φ = 934854492.

The previous prime is 943673977. The next prime is 943674041. The reversal of 943673981 is 189376349.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189376349 = 6389 ⋅29641.

It is a cyclic number.

It is not a de Polignac number, because 943673981 - 2² = 943673977 is a prime.

It is a super-2 number, since 2×943673981² = 1781041164832776722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (943673921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4409585 + ... + 4409798.

It is an arithmetic number, because the mean of its divisors is an integer number (238123368).

Almost surely, 2^943673981 is an apocalyptic number.

It is an amenable number.

943673981 is a deficient number, since it is larger than the sum of its proper divisors (8819491).

943673981 is a wasteful number, since it uses less digits than its factorization.

943673981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8819490.

The product of its digits is 979776, while the sum is 50.

The square root of 943673981 is about 30719.2770259979. The cubic root of 943673981 is about 980.8606839090.

The spelling of 943673981 in words is "nine hundred forty-three million, six hundred seventy-three thousand, nine hundred eighty-one".