57121823 has 4 divisors (see below), whose sum is σ = 62314728. Its totient is φ = 51928920.

The previous prime is 57121817. The next prime is 57121829. The reversal of 57121823 is 32812175.

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

It is an interprime number because it is at equal distance from previous prime (57121817) and next prime (57121829).

It is a cyclic number.

It is not a de Polignac number, because 57121823 - 2¹⁴ = 57105439 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 (57121829) 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, 2596436 + ... + 2596457.

It is an arithmetic number, because the mean of its divisors is an integer number (15578682).

Almost surely, 2^57121823 is an apocalyptic number.

57121823 is a deficient number, since it is larger than the sum of its proper divisors (5192905).

57121823 is a wasteful number, since it uses less digits than its factorization.

57121823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192904.

The product of its digits is 3360, while the sum is 29.

The square root of 57121823 is about 7557.8980543535. The cubic root of 57121823 is about 385.1240911063.

Adding to 57121823 its reverse (32812175), we get a palindrome (89933998).

The spelling of 57121823 in words is "fifty-seven million, one hundred twenty-one thousand, eight hundred twenty-three".