57121554 has 48 divisors (see below), whose sum is σ = 134332128. Its totient is φ = 16144128.

The previous prime is 57121553. The next prime is 57121573. The reversal of 57121554 is 45512175.

It is not an unprimeable number, because it can be changed into a prime (57121553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27517 + ... + 29519.

It is an arithmetic number, because the mean of its divisors is an integer number (2798586).

Almost surely, 2^57121554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57121554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67166064).

57121554 is an abundant number, since it is smaller than the sum of its proper divisors (77210574).

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

57121554 is a wasteful number, since it uses less digits than its factorization.

57121554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119 (or 2112 counting only the distinct ones).

The product of its digits is 7000, while the sum is 30.

The square root of 57121554 is about 7557.8802583793. The cubic root of 57121554 is about 385.1234865590.

It can be divided in two parts, 57121 and 554, that added together give a palindrome (57675).

The spelling of 57121554 in words is "fifty-seven million, one hundred twenty-one thousand, five hundred fifty-four".