55021679 has 2 divisors, whose sum is σ = 55021680. Its totient is φ = 55021678.

The previous prime is 55021649. The next prime is 55021691. The reversal of 55021679 is 97612055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55021679 - 2⁸ = 55021423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55021619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27510839 + 27510840.

It is an arithmetic number, because the mean of its divisors is an integer number (27510840).

Almost surely, 2^55021679 is an apocalyptic number.

55021679 is a deficient number, since it is larger than the sum of its proper divisors (1).

55021679 is an equidigital number, since it uses as much as digits as its factorization.

55021679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 55021679 is about 7417.6599409787. The cubic root of 55021679 is about 380.3452056983.

The spelling of 55021679 in words is "fifty-five million, twenty-one thousand, six hundred seventy-nine".