51234409 has 4 divisors (see below), whose sum is σ = 53462016. Its totient is φ = 49006804.

The previous prime is 51234389. The next prime is 51234433. The reversal of 51234409 is 90443215.

51234409 is digitally balanced in base 2, 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, and also an emirpimes, since its reverse is a distinct semiprime: 90443215 = 5 ⋅18088643.

It is a cyclic number.

It is not a de Polignac number, because 51234409 - 2¹¹ = 51232361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51234439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1113769 + ... + 1113814.

It is an arithmetic number, because the mean of its divisors is an integer number (13365504).

Almost surely, 2^51234409 is an apocalyptic number.

It is an amenable number.

51234409 is a deficient number, since it is larger than the sum of its proper divisors (2227607).

51234409 is a wasteful number, since it uses less digits than its factorization.

51234409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227606.

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

The square root of 51234409 is about 7157.8215261349. The cubic root of 51234409 is about 371.4102716188.

The spelling of 51234409 in words is "fifty-one million, two hundred thirty-four thousand, four hundred nine".