57012191 has 4 divisors (see below), whose sum is σ = 57048984. Its totient is φ = 56975400.

The previous prime is 57012157. The next prime is 57012199. The reversal of 57012191 is 19121075.

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 57012191 - 2¹⁸ = 56750047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57012191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57012199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15965 + ... + 19206.

It is an arithmetic number, because the mean of its divisors is an integer number (14262246).

Almost surely, 2^57012191 is an apocalyptic number.

57012191 is a deficient number, since it is larger than the sum of its proper divisors (36793).

57012191 is a wasteful number, since it uses less digits than its factorization.

57012191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36792.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 57012191 is about 7550.6417608042. The cubic root of 57012191 is about 384.8775480592.

The spelling of 57012191 in words is "fifty-seven million, twelve thousand, one hundred ninety-one".