55908421 has 2 divisors, whose sum is σ = 55908422. Its totient is φ = 55908420.

The previous prime is 55908361. The next prime is 55908499. The reversal of 55908421 is 12480955.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48455521 + 7452900 = 6961^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 55908421 - 2⁹ = 55907909 is a prime.

It is a super-3 number, since 3×55908421³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55909421) 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, 27954210 + 27954211.

It is an arithmetic number, because the mean of its divisors is an integer number (27954211).

Almost surely, 2^55908421 is an apocalyptic number.

It is an amenable number.

55908421 is a deficient number, since it is larger than the sum of its proper divisors (1).

55908421 is an equidigital number, since it uses as much as digits as its factorization.

55908421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 55908421 is about 7477.1933905711. The cubic root of 55908421 is about 382.3775699986.

The spelling of 55908421 in words is "fifty-five million, nine hundred eight thousand, four hundred twenty-one".