55221949 has 2 divisors, whose sum is σ = 55221950. Its totient is φ = 55221948.

The previous prime is 55221913. The next prime is 55221973. The reversal of 55221949 is 94912255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 15657849 = 6290^2 + 3957^2 .

It is a cyclic number.

It is not a de Polignac number, because 55221949 - 2⁷ = 55221821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55221979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27610974 + 27610975.

It is an arithmetic number, because the mean of its divisors is an integer number (27610975).

Almost surely, 2^55221949 is an apocalyptic number.

It is an amenable number.

55221949 is a deficient number, since it is larger than the sum of its proper divisors (1).

55221949 is an equidigital number, since it uses as much as digits as its factorization.

55221949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 55221949 is about 7431.1472196425. The cubic root of 55221949 is about 380.8061119239.

The spelling of 55221949 in words is "fifty-five million, two hundred twenty-one thousand, nine hundred forty-nine".