51522409 has 2 divisors, whose sum is σ = 51522410. Its totient is φ = 51522408.

The previous prime is 51522407. The next prime is 51522439. The reversal of 51522409 is 90422515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50808384 + 714025 = 7128^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 51522409 - 2¹ = 51522407 is a prime.

Together with 51522407, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51522407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25761204 + 25761205.

It is an arithmetic number, because the mean of its divisors is an integer number (25761205).

Almost surely, 2^51522409 is an apocalyptic number.

It is an amenable number.

51522409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51522409 is an equidigital number, since it uses as much as digits as its factorization.

51522409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51522409 is about 7177.9111864107. The cubic root of 51522409 is about 372.1048982512.

The spelling of 51522409 in words is "fifty-one million, five hundred twenty-two thousand, four hundred nine".