54431209 has 12 divisors (see below), whose sum is σ = 64189524. Its totient is φ = 46013184.

The previous prime is 54431197. The next prime is 54431213. The reversal of 54431209 is 90213445.

It can be written as a sum of positive squares in 2 ways, for example, as 39337984 + 15093225 = 6272^2 + 3885^2 .

It is not a de Polignac number, because 54431209 - 2¹⁷ = 54300137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54431809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4032 + ... + 11185.

It is an arithmetic number, because the mean of its divisors is an integer number (5349127).

Almost surely, 2^54431209 is an apocalyptic number.

It is an amenable number.

54431209 is a deficient number, since it is larger than the sum of its proper divisors (9758315).

54431209 is a wasteful number, since it uses less digits than its factorization.

54431209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15304 (or 15297 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 54431209 is about 7377.7509445630. The cubic root of 54431209 is about 378.9797400773.

The spelling of 54431209 in words is "fifty-four million, four hundred thirty-one thousand, two hundred nine".