998172553 has 8 divisors (see below), whose sum is σ = 1142097408. Its totient is φ = 854579904.

The previous prime is 998172551. The next prime is 998172577. The reversal of 998172553 is 355271899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998172553 - 2¹ = 998172551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 998172497 and 998172506.

It is not an unprimeable number, because it can be changed into a prime (998172551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76576 + ... + 88657.

It is an arithmetic number, because the mean of its divisors is an integer number (142762176).

Almost surely, 2^998172553 is an apocalyptic number.

It is an amenable number.

998172553 is a deficient number, since it is larger than the sum of its proper divisors (143924855).

998172553 is a wasteful number, since it uses less digits than its factorization.

998172553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166103.

The product of its digits is 680400, while the sum is 49.

The square root of 998172553 is about 31593.8689147119. The cubic root of 998172553 is about 999.3904795603.

The spelling of 998172553 in words is "nine hundred ninety-eight million, one hundred seventy-two thousand, five hundred fifty-three".