55251121 has 2 divisors, whose sum is σ = 55251122. Its totient is φ = 55251120.

The previous prime is 55251113. The next prime is 55251151. The reversal of 55251121 is 12115255.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38937600 + 16313521 = 6240^2 + 4039^2 .

It is a cyclic number.

It is not a de Polignac number, because 55251121 - 2³ = 55251113 is a prime.

It is a super-3 number, since 3×55251121³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55251092 and 55251101.

It is not a weakly prime, because it can be changed into another prime (55251151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27625560 + 27625561.

It is an arithmetic number, because the mean of its divisors is an integer number (27625561).

Almost surely, 2^55251121 is an apocalyptic number.

It is an amenable number.

55251121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55251121 is an equidigital number, since it uses as much as digits as its factorization.

55251121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 500, while the sum is 22.

The square root of 55251121 is about 7433.1097798970. The cubic root of 55251121 is about 380.8731560402.

Adding to 55251121 its reverse (12115255), we get a palindrome (67366376).

The spelling of 55251121 in words is "fifty-five million, two hundred fifty-one thousand, one hundred twenty-one".