57121000 has 48 divisors (see below), whose sum is σ = 134224740. Its totient is φ = 22752800.

The previous prime is 57120989. The next prime is 57121021. The reversal of 57121000 is 12175.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 38613796 + 18507204 = 6214^2 + 4302^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238881 + ... + 239119.

Almost surely, 2^57121000 is an apocalyptic number.

57121000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67112370).

57121000 is an abundant number, since it is smaller than the sum of its proper divisors (77103740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57121000 is an equidigital number, since it uses as much as digits as its factorization.

57121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 57121000 is about 7557.8436078024. The cubic root of 57121000 is about 385.1222415000.

Adding to 57121000 its reverse (12175), we get a palindrome (57133175).

The spelling of 57121000 in words is "fifty-seven million, one hundred twenty-one thousand".