998931097 has 2 divisors, whose sum is σ = 998931098. Its totient is φ = 998931096.

The previous prime is 998931083. The next prime is 998931103. The reversal of 998931097 is 790139899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 760877056 + 238054041 = 27584^2 + 15429^2 .

It is a cyclic number.

It is not a de Polignac number, because 998931097 - 2²³ = 990542489 is a prime.

It is not a weakly prime, because it can be changed into another prime (998931047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499465548 + 499465549.

It is an arithmetic number, because the mean of its divisors is an integer number (499465549).

Almost surely, 2^998931097 is an apocalyptic number.

It is an amenable number.

998931097 is a deficient number, since it is larger than the sum of its proper divisors (1).

998931097 is an equidigital number, since it uses as much as digits as its factorization.

998931097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 998931097 is about 31605.8712425397. The cubic root of 998931097 is about 999.6435719742.

The spelling of 998931097 in words is "nine hundred ninety-eight million, nine hundred thirty-one thousand, ninety-seven".