57161801 has 4 divisors (see below), whose sum is σ = 57181572. Its totient is φ = 57142032.

The previous prime is 57161789. The next prime is 57161821. The reversal of 57161801 is 10816175.

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 48664576 + 8497225 = 6976^2 + 2915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57161801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57161821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4610 + ... + 11643.

It is an arithmetic number, because the mean of its divisors is an integer number (14295393).

Almost surely, 2^57161801 is an apocalyptic number.

It is an amenable number.

57161801 is a deficient number, since it is larger than the sum of its proper divisors (19771).

57161801 is a wasteful number, since it uses less digits than its factorization.

57161801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19770.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 57161801 is about 7560.5423747242. The cubic root of 57161801 is about 385.2139160900.

Adding to 57161801 its reverse (10816175), we get a palindrome (67977976).

The spelling of 57161801 in words is "fifty-seven million, one hundred sixty-one thousand, eight hundred one".