55761421 has 2 divisors, whose sum is σ = 55761422. Its totient is φ = 55761420.

The previous prime is 55761401. The next prime is 55761427. The reversal of 55761421 is 12416755.

55761421 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., 50965321 + 4796100 = 7139^2 + 2190^2 .

It is a cyclic number.

It is not a de Polignac number, because 55761421 - 2¹⁷ = 55630349 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 (55761427) 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, 27880710 + 27880711.

It is an arithmetic number, because the mean of its divisors is an integer number (27880711).

Almost surely, 2^55761421 is an apocalyptic number.

It is an amenable number.

55761421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55761421 is an equidigital number, since it uses as much as digits as its factorization.

55761421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 55761421 is about 7467.3570290967. The cubic root of 55761421 is about 382.0421474287.

The spelling of 55761421 in words is "fifty-five million, seven hundred sixty-one thousand, four hundred twenty-one".