998916531 has 16 divisors (see below), whose sum is σ = 1366189440. Its totient is φ = 648869760.

The previous prime is 998916517. The next prime is 998916533. The reversal of 998916531 is 135619899.

It is a happy number.

998916531 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 998916531 - 2⁹ = 998916019 is a prime.

It is a super-2 number, since 2×998916531² = 1995668471810147922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (998916533) 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, 44811 + ... + 63291.

It is an arithmetic number, because the mean of its divisors is an integer number (85386840).

Almost surely, 2^998916531 is an apocalyptic number.

998916531 is a deficient number, since it is larger than the sum of its proper divisors (367272909).

998916531 is a wasteful number, since it uses less digits than its factorization.

998916531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18946.

The product of its digits is 524880, while the sum is 51.

The square root of 998916531 is about 31605.6408098301. The cubic root of 998916531 is about 999.6387131542.

The spelling of 998916531 in words is "nine hundred ninety-eight million, nine hundred sixteen thousand, five hundred thirty-one".