55461421 has 2 divisors, whose sum is σ = 55461422. Its totient is φ = 55461420.

The previous prime is 55461401. The next prime is 55461431. The reversal of 55461421 is 12416455.

55461421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29052100 + 26409321 = 5390^2 + 5139^2 .

It is a cyclic number.

It is not a de Polignac number, because 55461421 - 2⁵ = 55461389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55461421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55461401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27730710 + 27730711.

It is an arithmetic number, because the mean of its divisors is an integer number (27730711).

Almost surely, 2^55461421 is an apocalyptic number.

It is an amenable number.

55461421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55461421 is an equidigital number, since it uses as much as digits as its factorization.

55461421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 28.

The square root of 55461421 is about 7447.2425098153. The cubic root of 55461421 is about 381.3557780127.

Adding to 55461421 its reverse (12416455), we get a palindrome (67877876).

The spelling of 55461421 in words is "fifty-five million, four hundred sixty-one thousand, four hundred twenty-one".