998172577 has 2 divisors, whose sum is σ = 998172578. Its totient is φ = 998172576.

The previous prime is 998172551. The next prime is 998172641. The reversal of 998172577 is 775271899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 647397136 + 350775441 = 25444^2 + 18729^2 .

It is a cyclic number.

It is not a de Polignac number, because 998172577 - 2⁷ = 998172449 is a prime.

It is not a weakly prime, because it can be changed into another prime (998172517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499086288 + 499086289.

It is an arithmetic number, because the mean of its divisors is an integer number (499086289).

Almost surely, 2^998172577 is an apocalyptic number.

It is an amenable number.

998172577 is a deficient number, since it is larger than the sum of its proper divisors (1).

998172577 is an equidigital number, since it uses as much as digits as its factorization.

998172577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 55.

The square root of 998172577 is about 31593.8692945324. The cubic root of 998172577 is about 999.3904875701.

The spelling of 998172577 in words is "nine hundred ninety-eight million, one hundred seventy-two thousand, five hundred seventy-seven".