55021949 has 2 divisors, whose sum is σ = 55021950. Its totient is φ = 55021948.

The previous prime is 55021937. The next prime is 55021969. The reversal of 55021949 is 94912055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31158724 + 23863225 = 5582^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 55021949 - 2⁴ = 55021933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55021909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27510974 + 27510975.

It is an arithmetic number, because the mean of its divisors is an integer number (27510975).

Almost surely, 2^55021949 is an apocalyptic number.

It is an amenable number.

55021949 is a deficient number, since it is larger than the sum of its proper divisors (1).

55021949 is an equidigital number, since it uses as much as digits as its factorization.

55021949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 55021949 is about 7417.6781407662. The cubic root of 55021949 is about 380.3458278351.

The spelling of 55021949 in words is "fifty-five million, twenty-one thousand, nine hundred forty-nine".