55490101 has 2 divisors, whose sum is σ = 55490102. Its totient is φ = 55490100.

The previous prime is 55490063. The next prime is 55490131. The reversal of 55490101 is 10109455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55487601 + 2500 = 7449^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 55490101 - 2²¹ = 53392949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55490131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27745050 + 27745051.

It is an arithmetic number, because the mean of its divisors is an integer number (27745051).

Almost surely, 2^55490101 is an apocalyptic number.

It is an amenable number.

55490101 is a deficient number, since it is larger than the sum of its proper divisors (1).

55490101 is an equidigital number, since it uses as much as digits as its factorization.

55490101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 55490101 is about 7449.1678058693. The cubic root of 55490101 is about 381.4215017703.

Adding to 55490101 its reverse (10109455), we get a palindrome (65599556).

The spelling of 55490101 in words is "fifty-five million, four hundred ninety thousand, one hundred one".