1551232998 has 128 divisors (see below), whose sum is σ = 4244275200. Its totient is φ = 410036256.

The previous prime is 1551232993. The next prime is 1551233011. The reversal of 1551232998 is 8992321551.

1551232998 is a `hidden beast` number, since 1 + 551 + 2 + 3 + 2 + 9 + 98 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551232993) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 306315 + ... + 311337.

It is an arithmetic number, because the mean of its divisors is an integer number (33158400).

Almost surely, 2^1551232998 is an apocalyptic number.

1551232998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551232998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2122137600).

1551232998 is an abundant number, since it is smaller than the sum of its proper divisors (2693042202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551232998 is a wasteful number, since it uses less digits than its factorization.

1551232998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103 (or 5097 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 1551232998 is about 39385.6953474228. The cubic root of 1551232998 is about 1157.6013151415.

The spelling of 1551232998 in words is "one billion, five hundred fifty-one million, two hundred thirty-two thousand, nine hundred ninety-eight".