51164909 has 4 divisors (see below), whose sum is σ = 52003740. Its totient is φ = 50326080.

The previous prime is 51164863. The next prime is 51164921. The reversal of 51164909 is 90946115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4884100 + 46280809 = 2210^2 + 6803^2 .

It is a cyclic number.

It is not a de Polignac number, because 51164909 - 2⁸ = 51164653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51164989) 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, 419324 + ... + 419445.

It is an arithmetic number, because the mean of its divisors is an integer number (13000935).

Almost surely, 2^51164909 is an apocalyptic number.

It is an amenable number.

51164909 is a deficient number, since it is larger than the sum of its proper divisors (838831).

51164909 is an equidigital number, since it uses as much as digits as its factorization.

51164909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838830.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 51164909 is about 7152.9650495441. The cubic root of 51164909 is about 371.2422550127.

The spelling of 51164909 in words is "fifty-one million, one hundred sixty-four thousand, nine hundred nine".