998591601 has 16 divisors (see below), whose sum is σ = 1542510464. Its totient is φ = 562806144.

The previous prime is 998591591. The next prime is 998591639. The reversal of 998591601 is 106195899.

998591601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 998591601 - 2¹⁰ = 998590577 is a prime.

It is the 31601-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998591681) by changing a digit.

It is a nontrivial repunit in base 31600.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324166 + ... + 327231.

It is an arithmetic number, because the mean of its divisors is an integer number (96406904).

Almost surely, 2^998591601 is an apocalyptic number.

It is an amenable number.

998591601 is a deficient number, since it is larger than the sum of its proper divisors (543918863).

998591601 is a wasteful number, since it uses less digits than its factorization.

998591601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651480.

The product of its (nonzero) digits is 174960, while the sum is 48.

The square root of 998591601 is about 31600.5000118669. The cubic root of 998591601 is about 999.5303130954.

The spelling of 998591601 in words is "nine hundred ninety-eight million, five hundred ninety-one thousand, six hundred one".