57191481 has 16 divisors (see below), whose sum is σ = 85101120. Its totient is φ = 37959840.

The previous prime is 57191467. The next prime is 57191483. The reversal of 57191481 is 18419175.

57191481 is a `hidden beast` number, since 571 + 9 + 1 + 4 + 81 = 666.

57191481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 57191481 - 2¹⁰ = 57190457 is a prime.

It is a super-4 number, since 4×57191481⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (57191483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746 + ... + 10836.

It is an arithmetic number, because the mean of its divisors is an integer number (5318820).

Almost surely, 2^57191481 is an apocalyptic number.

It is an amenable number.

57191481 is a deficient number, since it is larger than the sum of its proper divisors (27909639).

57191481 is a wasteful number, since it uses less digits than its factorization.

57191481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9333 (or 9327 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 57191481 is about 7562.5049421471. The cubic root of 57191481 is about 385.2805758207.

The spelling of 57191481 in words is "fifty-seven million, one hundred ninety-one thousand, four hundred eighty-one".