55561523 has 2 divisors, whose sum is σ = 55561524. Its totient is φ = 55561522.

The previous prime is 55561511. The next prime is 55561549. The reversal of 55561523 is 32516555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55561523 - 2¹² = 55557427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55561523.

It is not a weakly prime, because it can be changed into another prime (55561573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27780761 + 27780762.

It is an arithmetic number, because the mean of its divisors is an integer number (27780762).

Almost surely, 2^55561523 is an apocalyptic number.

55561523 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561523 is an equidigital number, since it uses as much as digits as its factorization.

55561523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 32.

The square root of 55561523 is about 7453.9602225931. The cubic root of 55561523 is about 381.5850757326.

The spelling of 55561523 in words is "fifty-five million, five hundred sixty-one thousand, five hundred twenty-three".