55796809 has 2 divisors, whose sum is σ = 55796810. Its totient is φ = 55796808.

The previous prime is 55796791. The next prime is 55796837. The reversal of 55796809 is 90869755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51796809 + 4000000 = 7197^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 55796809 - 2¹⁵ = 55764041 is a prime.

It is a super-2 number, since 2×55796809² = 6226567789164962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55796009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27898404 + 27898405.

It is an arithmetic number, because the mean of its divisors is an integer number (27898405).

Almost surely, 2^55796809 is an apocalyptic number.

It is an amenable number.

55796809 is a deficient number, since it is larger than the sum of its proper divisors (1).

55796809 is an equidigital number, since it uses as much as digits as its factorization.

55796809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 55796809 is about 7469.7261663330. The cubic root of 55796809 is about 382.1229491029.

The spelling of 55796809 in words is "fifty-five million, seven hundred ninety-six thousand, eight hundred nine".