1631278998 has 12 divisors (see below), whose sum is σ = 3534437868. Its totient is φ = 543759660.

The previous prime is 1631278937. The next prime is 1631279009. The reversal of 1631278998 is 8998721361.

It is a super-2 number, since 2×1631278998² = 5322142338631768008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45313288 + ... + 45313323.

It is an arithmetic number, because the mean of its divisors is an integer number (294536489).

Almost surely, 2^1631278998 is an apocalyptic number.

1631278998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1631278998 is an abundant number, since it is smaller than the sum of its proper divisors (1903158870).

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

1631278998 is a wasteful number, since it uses less digits than its factorization.

1631278998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90626619 (or 90626616 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1631278998 is about 40389.0950381412. The cubic root of 1631278998 is about 1177.1796567279.

It can be divided in two parts, 163 and 1278998, that added together give a square (1279161 = 1131²).

The spelling of 1631278998 in words is "one billion, six hundred thirty-one million, two hundred seventy-eight thousand, nine hundred ninety-eight".