998139223 has 2 divisors, whose sum is σ = 998139224. Its totient is φ = 998139222.

The previous prime is 998139199. The next prime is 998139239. The reversal of 998139223 is 322931899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998139223 - 2²⁵ = 964584791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998139253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499069611 + 499069612.

It is an arithmetic number, because the mean of its divisors is an integer number (499069612).

Almost surely, 2^998139223 is an apocalyptic number.

998139223 is a deficient number, since it is larger than the sum of its proper divisors (1).

998139223 is an equidigital number, since it uses as much as digits as its factorization.

998139223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 998139223 is about 31593.3414345491. The cubic root of 998139223 is about 999.3793558806.

The spelling of 998139223 in words is "nine hundred ninety-eight million, one hundred thirty-nine thousand, two hundred twenty-three".