998235279247 has 4 divisors (see below), whose sum is σ = 998237777040. Its totient is φ = 998232781456.

The previous prime is 998235279229. The next prime is 998235279289. The reversal of 998235279247 is 742972532899.

It is a semiprime because it is the product of two primes.

It is a 4-Lehmer number, since φ(998235279247) divides (998235279247-1)⁴.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998235279247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998235579247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499558 + ... + 1498675.

It is an arithmetic number, because the mean of its divisors is an integer number (249559444260).

Almost surely, 2^998235279247 is an apocalyptic number.

998235279247 is the 499559-th decagonal number.

998235279247 is a deficient number, since it is larger than the sum of its proper divisors (2497793).

998235279247 is a wasteful number, since it uses less digits than its factorization.

998235279247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497792.

The product of its digits is 137168640, while the sum is 67.

The spelling of 998235279247 in words is "nine hundred ninety-eight billion, two hundred thirty-five million, two hundred seventy-nine thousand, two hundred forty-seven".