51645229 has 4 divisors (see below), whose sum is σ = 53041084. Its totient is φ = 50249376.

The previous prime is 51645227. The next prime is 51645233. The reversal of 51645229 is 92254615.

It is a happy number.

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 48972004 + 2673225 = 6998^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 51645229 - 2¹ = 51645227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51645194 and 51645203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697872 + ... + 697945.

It is an arithmetic number, because the mean of its divisors is an integer number (13260271).

Almost surely, 2^51645229 is an apocalyptic number.

It is an amenable number.

51645229 is a deficient number, since it is larger than the sum of its proper divisors (1395855).

51645229 is a wasteful number, since it uses less digits than its factorization.

51645229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395854.

The product of its digits is 21600, while the sum is 34.

The square root of 51645229 is about 7186.4615075849. The cubic root of 51645229 is about 372.4003402896.

The spelling of 51645229 in words is "fifty-one million, six hundred forty-five thousand, two hundred twenty-nine".