9987451 has 4 divisors (see below), whose sum is σ = 10421712. Its totient is φ = 9553192.

The previous prime is 9987443. The next prime is 9987457. The reversal of 9987451 is 1547899.

9987451 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 1547899 = 883 ⋅1753.

It is a cyclic number.

It is not a de Polignac number, because 9987451 - 2³ = 9987443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9987398 and 9987407.

It is not an unprimeable number, because it can be changed into a prime (9987457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217096 + ... + 217141.

It is an arithmetic number, because the mean of its divisors is an integer number (2605428).

Almost surely, 2^9987451 is an apocalyptic number.

9987451 is a deficient number, since it is larger than the sum of its proper divisors (434261).

9987451 is a wasteful number, since it uses less digits than its factorization.

9987451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434260.

The product of its digits is 90720, while the sum is 43.

The square root of 9987451 is about 3160.2928661755. The cubic root of 9987451 is about 215.3533112766.

The spelling of 9987451 in words is "nine million, nine hundred eighty-seven thousand, four hundred fifty-one".