385055551 has 2 divisors, whose sum is σ = 385055552. Its totient is φ = 385055550.

The previous prime is 385055543. The next prime is 385055597. The reversal of 385055551 is 155550583.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 385055551 - 2³ = 385055543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 385055551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385053551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192527775 + 192527776.

It is an arithmetic number, because the mean of its divisors is an integer number (192527776).

Almost surely, 2^385055551 is an apocalyptic number.

385055551 is a deficient number, since it is larger than the sum of its proper divisors (1).

385055551 is an equidigital number, since it uses as much as digits as its factorization.

385055551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75000, while the sum is 37.

The square root of 385055551 is about 19622.8323898463. The cubic root of 385055551 is about 727.5136220845.

The spelling of 385055551 in words is "three hundred eighty-five million, fifty-five thousand, five hundred fifty-one".