55570387 has 2 divisors, whose sum is σ = 55570388. Its totient is φ = 55570386.

The previous prime is 55570313. The next prime is 55570397. The reversal of 55570387 is 78307555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55570387 - 2²³ = 47181779 is a prime.

It is a super-2 number, since 2×55570387² = 6176135822659538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55570397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27785193 + 27785194.

It is an arithmetic number, because the mean of its divisors is an integer number (27785194).

Almost surely, 2^55570387 is an apocalyptic number.

55570387 is a deficient number, since it is larger than the sum of its proper divisors (1).

55570387 is an equidigital number, since it uses as much as digits as its factorization.

55570387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 147000, while the sum is 40.

The square root of 55570387 is about 7454.5547821449. The cubic root of 55570387 is about 381.6053666946.

The spelling of 55570387 in words is "fifty-five million, five hundred seventy thousand, three hundred eighty-seven".