55821767 has 2 divisors, whose sum is σ = 55821768. Its totient is φ = 55821766.

The previous prime is 55821757. The next prime is 55821769. The reversal of 55821767 is 76712855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55821767 - 2⁴ = 55821751 is a prime.

Together with 55821769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55821769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27910883 + 27910884.

It is an arithmetic number, because the mean of its divisors is an integer number (27910884).

Almost surely, 2^55821767 is an apocalyptic number.

55821767 is a deficient number, since it is larger than the sum of its proper divisors (1).

55821767 is an equidigital number, since it uses as much as digits as its factorization.

55821767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 41.

The square root of 55821767 is about 7471.3965896611. The cubic root of 55821767 is about 382.1799153411.

The spelling of 55821767 in words is "fifty-five million, eight hundred twenty-one thousand, seven hundred sixty-seven".