51822509 has 4 divisors (see below), whose sum is σ = 51855804. Its totient is φ = 51789216.

The previous prime is 51822503. The next prime is 51822527. The reversal of 51822509 is 90522815.

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 10824100 + 40998409 = 3290^2 + 6403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51822509 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 (51822503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14192 + ... + 17465.

It is an arithmetic number, because the mean of its divisors is an integer number (12963951).

Almost surely, 2^51822509 is an apocalyptic number.

It is an amenable number.

51822509 is a deficient number, since it is larger than the sum of its proper divisors (33295).

51822509 is a wasteful number, since it uses less digits than its factorization.

51822509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33294.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 51822509 is about 7198.7852447479. The cubic root of 51822509 is about 372.8259603461.

The spelling of 51822509 in words is "fifty-one million, eight hundred twenty-two thousand, five hundred nine".