998951615 has 4 divisors (see below), whose sum is σ = 1198741944. Its totient is φ = 799161288.

The previous prime is 998951609. The next prime is 998951623. The reversal of 998951615 is 516159899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 516159899 = 17 ⋅30362347.

It is a cyclic number.

It is not a de Polignac number, because 998951615 - 2¹² = 998947519 is a prime.

It is a super-2 number, since 2×998951615² = 1995808658222216450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99895157 + ... + 99895166.

It is an arithmetic number, because the mean of its divisors is an integer number (299685486).

Almost surely, 2^998951615 is an apocalyptic number.

998951615 is a deficient number, since it is larger than the sum of its proper divisors (199790329).

998951615 is a wasteful number, since it uses less digits than its factorization.

998951615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199790328.

The product of its digits is 874800, while the sum is 53.

The square root of 998951615 is about 31606.1958324630. The cubic root of 998951615 is about 999.6504161387.

The spelling of 998951615 in words is "nine hundred ninety-eight million, nine hundred fifty-one thousand, six hundred fifteen".