57145021 has 4 divisors (see below), whose sum is σ = 58538844. Its totient is φ = 55751200.

The previous prime is 57145019. The next prime is 57145043. The reversal of 57145021 is 12054175.

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 25908100 + 31236921 = 5090^2 + 5589^2 .

It is a cyclic number.

It is not a de Polignac number, because 57145021 - 2¹ = 57145019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57145061) 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, 696850 + ... + 696931.

It is an arithmetic number, because the mean of its divisors is an integer number (14634711).

Almost surely, 2^57145021 is an apocalyptic number.

It is an amenable number.

57145021 is a deficient number, since it is larger than the sum of its proper divisors (1393823).

57145021 is a wasteful number, since it uses less digits than its factorization.

57145021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393822.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 57145021 is about 7559.4325845264. The cubic root of 57145021 is about 385.1762188749.

Adding to 57145021 its reverse (12054175), we get a palindrome (69199196).

The spelling of 57145021 in words is "fifty-seven million, one hundred forty-five thousand, twenty-one".