8451331549 has 4 divisors (see below), whose sum is σ = 8530316064. Its totient is φ = 8372347036.

The previous prime is 8451331543. The next prime is 8451331561. The reversal of 8451331549 is 9451331548.

8451331549 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8451331549 - 2¹³ = 8451323357 is a prime.

It is a super-2 number, since 2×8451331549² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8451331543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39492097 + ... + 39492310.

It is an arithmetic number, because the mean of its divisors is an integer number (2132579016).

Almost surely, 2^8451331549 is an apocalyptic number.

It is an amenable number.

8451331549 is a deficient number, since it is larger than the sum of its proper divisors (78984515).

8451331549 is a wasteful number, since it uses less digits than its factorization.

8451331549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78984514.

The product of its digits is 259200, while the sum is 43.

The square root of 8451331549 is about 91931.1239406981. The cubic root of 8451331549 is about 2036.9250377315.

Subtracting 8451331549 from its reverse (9451331548), we obtain a palindrome (999999999).

The spelling of 8451331549 in words is "eight billion, four hundred fifty-one million, three hundred thirty-one thousand, five hundred forty-nine".