57123871 has 4 divisors (see below), whose sum is σ = 65284432. Its totient is φ = 48963312.

The previous prime is 57123851. The next prime is 57123889. The reversal of 57123871 is 17832175.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57123871 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 (57123811) 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, 4080270 + ... + 4080283.

It is an arithmetic number, because the mean of its divisors is an integer number (16321108).

Almost surely, 2^57123871 is an apocalyptic number.

57123871 is a deficient number, since it is larger than the sum of its proper divisors (8160561).

57123871 is an equidigital number, since it uses as much as digits as its factorization.

57123871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8160560.

The product of its digits is 11760, while the sum is 34.

The square root of 57123871 is about 7558.0335405448. The cubic root of 57123871 is about 385.1286936947.

It can be divided in two parts, 571 and 23871, that added together give a palindrome (24442).

The spelling of 57123871 in words is "fifty-seven million, one hundred twenty-three thousand, eight hundred seventy-one".