51722149 has 4 divisors (see below), whose sum is σ = 51870700. Its totient is φ = 51573600.

The previous prime is 51722131. The next prime is 51722159. The reversal of 51722149 is 94122715.

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 17791524 + 33930625 = 4218^2 + 5825^2 .

It is a cyclic number.

It is not a de Polignac number, because 51722149 - 2¹¹ = 51720101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51722149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51722119) 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, 73752 + ... + 74449.

It is an arithmetic number, because the mean of its divisors is an integer number (12967675).

Almost surely, 2^51722149 is an apocalyptic number.

It is an amenable number.

51722149 is a deficient number, since it is larger than the sum of its proper divisors (148551).

51722149 is a wasteful number, since it uses less digits than its factorization.

51722149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148550.

The product of its digits is 5040, while the sum is 31.

The square root of 51722149 is about 7191.8112461326. The cubic root of 51722149 is about 372.5851319619.

The spelling of 51722149 in words is "fifty-one million, seven hundred twenty-two thousand, one hundred forty-nine".