9928551 has 4 divisors (see below), whose sum is σ = 13238072. Its totient is φ = 6619032.

The previous prime is 9928547. The next prime is 9928553. The reversal of 9928551 is 1558299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1558299 = 3 ⋅519433.

It is not a de Polignac number, because 9928551 - 2² = 9928547 is a prime.

It is a super-2 number, since 2×9928551² = 197152249919202, which contains 22 as substring.

It is a Duffinian number.

9928551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9928553) 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 in 3 ways as a sum of consecutive naturals, for example, 1654756 + ... + 1654761.

It is an arithmetic number, because the mean of its divisors is an integer number (3309518).

Almost surely, 2^9928551 is an apocalyptic number.

9928551 is a deficient number, since it is larger than the sum of its proper divisors (3309521).

9928551 is a wasteful number, since it uses less digits than its factorization.

9928551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309520.

The product of its digits is 32400, while the sum is 39.

The square root of 9928551 is about 3150.9603298042. The cubic root of 9928551 is about 214.9291347484.

The spelling of 9928551 in words is "nine million, nine hundred twenty-eight thousand, five hundred fifty-one".