51623609 has 2 divisors, whose sum is σ = 51623610. Its totient is φ = 51623608.

The previous prime is 51623597. The next prime is 51623623. The reversal of 51623609 is 90632615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43626025 + 7997584 = 6605^2 + 2828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51623609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51623639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25811804 + 25811805.

It is an arithmetic number, because the mean of its divisors is an integer number (25811805).

Almost surely, 2^51623609 is an apocalyptic number.

It is an amenable number.

51623609 is a deficient number, since it is larger than the sum of its proper divisors (1).

51623609 is an equidigital number, since it uses as much as digits as its factorization.

51623609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 51623609 is about 7184.9571327879. The cubic root of 51623609 is about 372.3483676339.

The spelling of 51623609 in words is "fifty-one million, six hundred twenty-three thousand, six hundred nine".