998737641 has 128 divisors (see below), whose sum is σ = 1866240000. Its totient is φ = 519644160.

The previous prime is 998737637. The next prime is 998737667. The reversal of 998737641 is 146737899.

It is a happy number.

It is not a de Polignac number, because 998737641 - 2² = 998737637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998737631) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 2781820 + ... + 2782178.

It is an arithmetic number, because the mean of its divisors is an integer number (14580000).

Almost surely, 2^998737641 is an apocalyptic number.

It is an amenable number.

998737641 is a deficient number, since it is larger than the sum of its proper divisors (867502359).

998737641 is a wasteful number, since it uses less digits than its factorization.

998737641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 438 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 998737641 is about 31602.8106503203. The cubic root of 998737641 is about 999.5790364812.

The spelling of 998737641 in words is "nine hundred ninety-eight million, seven hundred thirty-seven thousand, six hundred forty-one".