57145191 has 4 divisors (see below), whose sum is σ = 76193592. Its totient is φ = 38096792.

The previous prime is 57145189. The next prime is 57145201. The reversal of 57145191 is 19154175.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57145191 - 2¹ = 57145189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57145391) 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 in 3 ways as a sum of consecutive naturals, for example, 9524196 + ... + 9524201.

It is an arithmetic number, because the mean of its divisors is an integer number (19048398).

Almost surely, 2^57145191 is an apocalyptic number.

57145191 is a deficient number, since it is larger than the sum of its proper divisors (19048401).

57145191 is a wasteful number, since it uses less digits than its factorization.

57145191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19048400.

The product of its digits is 6300, while the sum is 33.

The square root of 57145191 is about 7559.4438287482. The cubic root of 57145191 is about 385.1766008265.

The spelling of 57145191 in words is "fifty-seven million, one hundred forty-five thousand, one hundred ninety-one".