8431641 has 8 divisors (see below), whose sum is σ = 12491360. Its totient is φ = 5621076.

The previous prime is 8431637. The next prime is 8431651. The reversal of 8431641 is 1461348.

It is not a de Polignac number, because 8431641 - 2² = 8431637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 312283 = 8431641 / (8 + 4 + 3 + 1 + 6 + 4 + 1).

It is an Ulam number.

It is a Duffinian number.

8431641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8431651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156115 + ... + 156168.

It is an arithmetic number, because the mean of its divisors is an integer number (1561420).

Almost surely, 2^8431641 is an apocalyptic number.

It is an amenable number.

8431641 is a deficient number, since it is larger than the sum of its proper divisors (4059719).

8431641 is a wasteful number, since it uses less digits than its factorization.

8431641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312292 (or 312286 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 8431641 is about 2903.7288096515. The cubic root of 8431641 is about 203.5341880433.

Adding to 8431641 its reverse (1461348), we get a palindrome (9892989).

It can be divided in two parts, 8 and 431641, that added together give a square (431649 = 657²).

The spelling of 8431641 in words is "eight million, four hundred thirty-one thousand, six hundred forty-one".