55835561 has 2 divisors, whose sum is σ = 55835562. Its totient is φ = 55835560.

The previous prime is 55835551. The next prime is 55835567. The reversal of 55835561 is 16553855.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 13987600 = 6469^2 + 3740^2 .

It is a cyclic number.

It is not a de Polignac number, because 55835561 - 2¹⁸ = 55573417 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 (55835567) 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 as a sum of consecutive naturals, namely, 27917780 + 27917781.

It is an arithmetic number, because the mean of its divisors is an integer number (27917781).

Almost surely, 2^55835561 is an apocalyptic number.

It is an amenable number.

55835561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55835561 is an equidigital number, since it uses as much as digits as its factorization.

55835561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90000, while the sum is 38.

The square root of 55835561 is about 7472.3196532268. The cubic root of 55835561 is about 382.2113926414.

The spelling of 55835561 in words is "fifty-five million, eight hundred thirty-five thousand, five hundred sixty-one".