51722109 has 24 divisors (see below), whose sum is σ = 81839160. Its totient is φ = 31331328.

The previous prime is 51722107. The next prime is 51722113. The reversal of 51722109 is 90122715.

It can be written as a sum of positive squares in 4 ways, for example, as 20115225 + 31606884 = 4485^2 + 5622^2 .

It is not a de Polignac number, because 51722109 - 2¹ = 51722107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51722107) 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, 1392 + ... + 10265.

It is an arithmetic number, because the mean of its divisors is an integer number (3409965).

Almost surely, 2^51722109 is an apocalyptic number.

It is an amenable number.

51722109 is a deficient number, since it is larger than the sum of its proper divisors (30117051).

51722109 is a wasteful number, since it uses less digits than its factorization.

51722109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11709 (or 11706 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51722109 is about 7191.8084651915. The cubic root of 51722109 is about 372.5850359140.

The spelling of 51722109 in words is "fifty-one million, seven hundred twenty-two thousand, one hundred nine".