998839951 has 2 divisors, whose sum is σ = 998839952. Its totient is φ = 998839950.

The previous prime is 998839949. The next prime is 998839979. The reversal of 998839951 is 159938899.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 998839951 - 2¹ = 998839949 is a prime.

It is a super-3 number, since 3×998839951³ (a number of 28 digits) contains 333 as substring.

Together with 998839949, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 998839951.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419975 + 499419976.

It is an arithmetic number, because the mean of its divisors is an integer number (499419976).

Almost surely, 2^998839951 is an apocalyptic number.

998839951 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839951 is an equidigital number, since it uses as much as digits as its factorization.

998839951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6298560, while the sum is 61.

The square root of 998839951 is about 31604.4292940088. The cubic root of 998839951 is about 999.6131673798.

The spelling of 998839951 in words is "nine hundred ninety-eight million, eight hundred thirty-nine thousand, nine hundred fifty-one".