55074421 has 2 divisors, whose sum is σ = 55074422. Its totient is φ = 55074420.

The previous prime is 55074419. The next prime is 55074427. The reversal of 55074421 is 12447055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 13793796 = 6425^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 55074421 - 2¹ = 55074419 is a prime.

Together with 55074419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 55074421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55074427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27537210 + 27537211.

It is an arithmetic number, because the mean of its divisors is an integer number (27537211).

Almost surely, 2^55074421 is an apocalyptic number.

It is an amenable number.

55074421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55074421 is an equidigital number, since it uses as much as digits as its factorization.

55074421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 55074421 is about 7421.2142537458. The cubic root of 55074421 is about 380.4666957542.

The spelling of 55074421 in words is "fifty-five million, seventy-four thousand, four hundred twenty-one".