57191089 has 4 divisors (see below), whose sum is σ = 57294324. Its totient is φ = 57087856.

The previous prime is 57191053. The next prime is 57191107. The reversal of 57191089 is 98019175.

It is a happy number.

57191089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10131489 + 47059600 = 3183^2 + 6860^2 .

It is a cyclic number.

It is not a de Polignac number, because 57191089 - 2⁷ = 57190961 is a prime.

It is a super-2 number, since 2×57191089² = 6541641322011842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57191039) 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 3 ways as a sum of consecutive naturals, for example, 50782 + ... + 51895.

It is an arithmetic number, because the mean of its divisors is an integer number (14323581).

Almost surely, 2^57191089 is an apocalyptic number.

It is an amenable number.

57191089 is a deficient number, since it is larger than the sum of its proper divisors (103235).

57191089 is a wasteful number, since it uses less digits than its factorization.

57191089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103234.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 57191089 is about 7562.4790247643. The cubic root of 57191089 is about 385.2796955595.

The spelling of 57191089 in words is "fifty-seven million, one hundred ninety-one thousand, eighty-nine".