998653531 has 4 divisors (see below), whose sum is σ = 1007815600. Its totient is φ = 989491464.

The previous prime is 998653519. The next prime is 998653549. The reversal of 998653531 is 135356899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135356899 = 757 ⋅178807.

It is a cyclic number.

It is not a de Polignac number, because 998653531 - 2¹⁹ = 998129243 is a prime.

It is a super-2 number, since 2×998653531² = 1994617749957535922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998656531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4580871 + ... + 4581088.

It is an arithmetic number, because the mean of its divisors is an integer number (251953900).

Almost surely, 2^998653531 is an apocalyptic number.

998653531 is a deficient number, since it is larger than the sum of its proper divisors (9162069).

998653531 is a wasteful number, since it uses less digits than its factorization.

998653531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9162068.

The product of its digits is 874800, while the sum is 49.

The square root of 998653531 is about 31601.4798862332. The cubic root of 998653531 is about 999.5509754071.

The spelling of 998653531 in words is "nine hundred ninety-eight million, six hundred fifty-three thousand, five hundred thirty-one".