55490321 has 2 divisors, whose sum is σ = 55490322. Its totient is φ = 55490320.

The previous prime is 55490287. The next prime is 55490353. The reversal of 55490321 is 12309455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 7728400 = 6911^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 55490321 - 2¹⁰ = 55489297 is a prime.

It is not a weakly prime, because it can be changed into another prime (55490381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27745160 + 27745161.

It is an arithmetic number, because the mean of its divisors is an integer number (27745161).

Almost surely, 2^55490321 is an apocalyptic number.

It is an amenable number.

55490321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55490321 is an equidigital number, since it uses as much as digits as its factorization.

55490321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 55490321 is about 7449.1825726049. The cubic root of 55490321 is about 381.4220058400.

Adding to 55490321 its reverse (12309455), we get a palindrome (67799776).

The spelling of 55490321 in words is "fifty-five million, four hundred ninety thousand, three hundred twenty-one".