55591633 has 2 divisors, whose sum is σ = 55591634. Its totient is φ = 55591632.

The previous prime is 55591631. The next prime is 55591681. The reversal of 55591633 is 33619555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47018449 + 8573184 = 6857^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 55591633 - 2¹ = 55591631 is a prime.

Together with 55591631, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 55591592 and 55591601.

It is not a weakly prime, because it can be changed into another prime (55591631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27795816 + 27795817.

It is an arithmetic number, because the mean of its divisors is an integer number (27795817).

Almost surely, 2^55591633 is an apocalyptic number.

It is an amenable number.

55591633 is a deficient number, since it is larger than the sum of its proper divisors (1).

55591633 is an equidigital number, since it uses as much as digits as its factorization.

55591633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 37.

The square root of 55591633 is about 7455.9796807663. The cubic root of 55591633 is about 381.6539930406.

The spelling of 55591633 in words is "fifty-five million, five hundred ninety-one thousand, six hundred thirty-three".