55379809 has 2 divisors, whose sum is σ = 55379810. Its totient is φ = 55379808.

The previous prime is 55379801. The next prime is 55379839. The reversal of 55379809 is 90897355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47651409 + 7728400 = 6903^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 55379809 - 2³ = 55379801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55379801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27689904 + 27689905.

It is an arithmetic number, because the mean of its divisors is an integer number (27689905).

Almost surely, 2^55379809 is an apocalyptic number.

It is an amenable number.

55379809 is a deficient number, since it is larger than the sum of its proper divisors (1).

55379809 is an equidigital number, since it uses as much as digits as its factorization.

55379809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 55379809 is about 7441.7611490829. The cubic root of 55379809 is about 381.1686299873.

The spelling of 55379809 in words is "fifty-five million, three hundred seventy-nine thousand, eight hundred nine".