998667031 has 2 divisors, whose sum is σ = 998667032. Its totient is φ = 998667030.

The previous prime is 998667029. The next prime is 998667049. The reversal of 998667031 is 130766899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998667031 - 2¹ = 998667029 is a prime.

It is a super-2 number, since 2×998667031² = 1994671677612709922, which contains 22 as substring.

Together with 998667029, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998667001) 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, 499333515 + 499333516.

It is an arithmetic number, because the mean of its divisors is an integer number (499333516).

Almost surely, 2^998667031 is an apocalyptic number.

998667031 is a deficient number, since it is larger than the sum of its proper divisors (1).

998667031 is an equidigital number, since it uses as much as digits as its factorization.

998667031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 998667031 is about 31601.6934831031. The cubic root of 998667031 is about 999.5554794307. Note that the first 3 decimals are identical.

The spelling of 998667031 in words is "nine hundred ninety-eight million, six hundred sixty-seven thousand, thirty-one".