409251 has 4 divisors (see below), whose sum is σ = 545672. Its totient is φ = 272832.

The previous prime is 409237. The next prime is 409259. The reversal of 409251 is 152904.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 409251 - 2⁶ = 409187 is a prime.

It is a D-number.

It is a Duffinian number.

409251 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 409251.

It is not an unprimeable number, because it can be changed into a prime (409259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68206 + ... + 68211.

It is an arithmetic number, because the mean of its divisors is an integer number (136418).

2⁴⁰⁹²⁵¹ is an apocalyptic number.

409251 is a deficient number, since it is larger than the sum of its proper divisors (136421).

409251 is a wasteful number, since it uses less digits than its factorization.

409251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136420.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 409251 is about 639.7272856460. The cubic root of 409251 is about 74.2443227075.

The spelling of 409251 in words is "four hundred nine thousand, two hundred fifty-one".