989454021 has 4 divisors (see below), whose sum is σ = 1319272032. Its totient is φ = 659636012.

The previous prime is 989454017. The next prime is 989454023. The reversal of 989454021 is 120454989.

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.

It is a cyclic number.

It is not a de Polignac number, because 989454021 - 2² = 989454017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989454023) 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, 164909001 + ... + 164909006.

It is an arithmetic number, because the mean of its divisors is an integer number (329818008).

Almost surely, 2^989454021 is an apocalyptic number.

It is an amenable number.

989454021 is a deficient number, since it is larger than the sum of its proper divisors (329818011).

989454021 is a wasteful number, since it uses less digits than its factorization.

989454021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329818010.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 989454021 is about 31455.5880727098. The cubic root of 989454021 is about 996.4722432333.

The spelling of 989454021 in words is "nine hundred eighty-nine million, four hundred fifty-four thousand, twenty-one".