998172641 has 2 divisors, whose sum is σ = 998172642. Its totient is φ = 998172640.

The previous prime is 998172577. The next prime is 998172649. The reversal of 998172641 is 146271899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 865830625 + 132342016 = 29425^2 + 11504^2 .

It is a cyclic number.

It is not a de Polignac number, because 998172641 - 2⁶ = 998172577 is a prime.

It is not a weakly prime, because it can be changed into another prime (998172649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499086320 + 499086321.

It is an arithmetic number, because the mean of its divisors is an integer number (499086321).

Almost surely, 2^998172641 is an apocalyptic number.

It is an amenable number.

998172641 is a deficient number, since it is larger than the sum of its proper divisors (1).

998172641 is an equidigital number, since it uses as much as digits as its factorization.

998172641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 998172641 is about 31593.8703073872. The cubic root of 998172641 is about 999.3905089294.

The spelling of 998172641 in words is "nine hundred ninety-eight million, one hundred seventy-two thousand, six hundred forty-one".