55021693 has 2 divisors, whose sum is σ = 55021694. Its totient is φ = 55021692.

The previous prime is 55021691. The next prime is 55021711. The reversal of 55021693 is 39612055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54199044 + 822649 = 7362^2 + 907^2 .

It is a cyclic number.

It is not a de Polignac number, because 55021693 - 2¹ = 55021691 is a prime.

Together with 55021691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55021691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27510846 + 27510847.

It is an arithmetic number, because the mean of its divisors is an integer number (27510847).

Almost surely, 2^55021693 is an apocalyptic number.

It is an amenable number.

55021693 is a deficient number, since it is larger than the sum of its proper divisors (1).

55021693 is an equidigital number, since it uses as much as digits as its factorization.

55021693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 55021693 is about 7417.6608846725. The cubic root of 55021693 is about 380.3452379573.

The spelling of 55021693 in words is "fifty-five million, twenty-one thousand, six hundred ninety-three".