55451609 has 2 divisors, whose sum is σ = 55451610. Its totient is φ = 55451608.

The previous prime is 55451581. The next prime is 55451647. The reversal of 55451609 is 90615455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38477209 + 16974400 = 6203^2 + 4120^2 .

It is a cyclic number.

It is not a de Polignac number, because 55451609 - 2⁸ = 55451353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55421609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27725804 + 27725805.

It is an arithmetic number, because the mean of its divisors is an integer number (27725805).

Almost surely, 2^55451609 is an apocalyptic number.

It is an amenable number.

55451609 is a deficient number, since it is larger than the sum of its proper divisors (1).

55451609 is an equidigital number, since it uses as much as digits as its factorization.

55451609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 55451609 is about 7446.5837133547. The cubic root of 55451609 is about 381.3332874027. Note that the first 3 decimals are identical.

The spelling of 55451609 in words is "fifty-five million, four hundred fifty-one thousand, six hundred nine".