55490401 has 2 divisors, whose sum is σ = 55490402. Its totient is φ = 55490400.

The previous prime is 55490399. The next prime is 55490411. The reversal of 55490401 is 10409455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34339600 + 21150801 = 5860^2 + 4599^2 .

It is a cyclic number.

It is not a de Polignac number, because 55490401 - 2¹ = 55490399 is a prime.

Together with 55490399, 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 55490401.

It is not a weakly prime, because it can be changed into another prime (55490411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27745200 + 27745201.

It is an arithmetic number, because the mean of its divisors is an integer number (27745201).

Almost surely, 2^55490401 is an apocalyptic number.

It is an amenable number.

55490401 is a deficient number, since it is larger than the sum of its proper divisors (1).

55490401 is an equidigital number, since it uses as much as digits as its factorization.

55490401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 55490401 is about 7449.1879423196. The cubic root of 55490401 is about 381.4221891377.

Adding to 55490401 its reverse (10409455), we get a palindrome (65899856).

The spelling of 55490401 in words is "fifty-five million, four hundred ninety thousand, four hundred one".