643149 has 24 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 376992.

The previous prime is 643129. The next prime is 643183. The reversal of 643149 is 941346.

643149 is a `hidden beast` number, since 643 + 14 + 9 = 666.

It is not a de Polignac number, because 643149 - 2⁷ = 643021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2572 + ... + 2810.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁶⁴³¹⁴⁹ is an apocalyptic number.

643149 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

643149 is a deficient number, since it is larger than the sum of its proper divisors (405171).

643149 is a wasteful number, since it uses less digits than its factorization.

643149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 278 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 643149 is about 801.9657099901. The cubic root of 643149 is about 86.3184963132.

The spelling of 643149 in words is "six hundred forty-three thousand, one hundred forty-nine".