1998004551 has 8 divisors (see below), whose sum is σ = 2736006384. Its totient is φ = 1296002880.

The previous prime is 1998004537. The next prime is 1998004597. The reversal of 1998004551 is 1554008991.

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

It is not a de Polignac number, because 1998004551 - 2²¹ = 1995907399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998004501) 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, 8999910 + ... + 9000131.

It is an arithmetic number, because the mean of its divisors is an integer number (342000798).

Almost surely, 2^1998004551 is an apocalyptic number.

1998004551 is a deficient number, since it is larger than the sum of its proper divisors (738001833).

1998004551 is a wasteful number, since it uses less digits than its factorization.

1998004551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18000081.

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 1998004551 is about 44699.0441844118. The cubic root of 1998004551 is about 1259.5018924295.

The spelling of 1998004551 in words is "one billion, nine hundred ninety-eight million, four thousand, five hundred fifty-one".