57121643 has 2 divisors, whose sum is σ = 57121644. Its totient is φ = 57121642.

The previous prime is 57121607. The next prime is 57121667. The reversal of 57121643 is 34612175.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57121643 - 2¹² = 57117547 is a prime.

It is not a weakly prime, because it can be changed into another prime (57121693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28560821 + 28560822.

It is an arithmetic number, because the mean of its divisors is an integer number (28560822).

Almost surely, 2^57121643 is an apocalyptic number.

57121643 is a deficient number, since it is larger than the sum of its proper divisors (1).

57121643 is an equidigital number, since it uses as much as digits as its factorization.

57121643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 57121643 is about 7557.8861462713. The cubic root of 57121643 is about 385.1236865767.

The spelling of 57121643 in words is "fifty-seven million, one hundred twenty-one thousand, six hundred forty-three".