51375409 has 4 divisors (see below), whose sum is σ = 51606016. Its totient is φ = 51144804.

The previous prime is 51375403. The next prime is 51375421. The reversal of 51375409 is 90457315.

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.

It is a cyclic number.

It is not a de Polignac number, because 51375409 - 2⁷ = 51375281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51375403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114969 + ... + 115414.

It is an arithmetic number, because the mean of its divisors is an integer number (12901504).

Almost surely, 2^51375409 is an apocalyptic number.

It is an amenable number.

51375409 is a deficient number, since it is larger than the sum of its proper divisors (230607).

51375409 is a wasteful number, since it uses less digits than its factorization.

51375409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230606.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 51375409 is about 7167.6641243853. The cubic root of 51375409 is about 371.7506735867.

The spelling of 51375409 in words is "fifty-one million, three hundred seventy-five thousand, four hundred nine".