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998724481 = 1317623851

998724481 has 4 divisors (see below), whose sum is σ = 1006348464. Its totient is φ = 991100500.

The previous prime is 998724473. The next prime is 998724497. The reversal of 998724481 is 184427899.

It is a happy number.

998724481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184427899 = 303760727.

It is a cyclic number.

It is not a de Polignac number, because 998724481 - 23 = 998724473 is a prime.

It is a super-2 number, since 2×9987244812 = 1994901177897438722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998724281) 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, 3811795 + ... + 3812056.

It is an arithmetic number, because the mean of its divisors is an integer number (251587116).

It is a Poulet number, since it divides 2998724480-1.

Almost surely, 2998724481 is an apocalyptic number.

It is an amenable number.

998724481 is a deficient number, since it is larger than the sum of its proper divisors (7623983).

998724481 is a wasteful number, since it uses less digits than its factorization.

998724481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7623982.

The product of its digits is 1161216, while the sum is 52.

The square root of 998724481 is about 31602.6024403055. The cubic root of 998724481 is about 999.5746460997.

The spelling of 998724481 in words is "nine hundred ninety-eight million, seven hundred twenty-four thousand, four hundred eighty-one".

Divisors: 1 131 7623851 998724481