55507811 has 2 divisors, whose sum is σ = 55507812. Its totient is φ = 55507810.

The previous prime is 55507789. The next prime is 55507819. The reversal of 55507811 is 11870555.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55507811 - 2¹⁴ = 55491427 is a prime.

It is a super-2 number, since 2×55507811² = 6162234164023442, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (55507819) 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, 27753905 + 27753906.

It is an arithmetic number, because the mean of its divisors is an integer number (27753906).

Almost surely, 2^55507811 is an apocalyptic number.

55507811 is a deficient number, since it is larger than the sum of its proper divisors (1).

55507811 is an equidigital number, since it uses as much as digits as its factorization.

55507811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 55507811 is about 7450.3564344265. The cubic root of 55507811 is about 381.4620751109.

The spelling of 55507811 in words is "fifty-five million, five hundred seven thousand, eight hundred eleven".