998641497 has 16 divisors (see below), whose sum is σ = 1522614272. Its totient is φ = 570324240.

The previous prime is 998641487. The next prime is 998641559. The reversal of 998641497 is 794146899.

It is not a de Polignac number, because 998641497 - 2¹⁵ = 998608729 is a prime.

It is a super-3 number, since 3×998641497³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998641447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26472 + ... + 51942.

It is an arithmetic number, because the mean of its divisors is an integer number (95163392).

Almost surely, 2^998641497 is an apocalyptic number.

It is an amenable number.

998641497 is a deficient number, since it is larger than the sum of its proper divisors (523972775).

998641497 is a wasteful number, since it uses less digits than its factorization.

998641497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27348.

The product of its digits is 3919104, while the sum is 57.

The square root of 998641497 is about 31601.2894831841. The cubic root of 998641497 is about 999.5469604528.

The spelling of 998641497 in words is "nine hundred ninety-eight million, six hundred forty-one thousand, four hundred ninety-seven".