57121447 has 2 divisors, whose sum is σ = 57121448. Its totient is φ = 57121446.

The previous prime is 57121409. The next prime is 57121469. The reversal of 57121447 is 74412175.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57121447 - 2¹⁵ = 57088679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57124447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28560723 + 28560724.

It is an arithmetic number, because the mean of its divisors is an integer number (28560724).

Almost surely, 2^57121447 is an apocalyptic number.

57121447 is a deficient number, since it is larger than the sum of its proper divisors (1).

57121447 is an equidigital number, since it uses as much as digits as its factorization.

57121447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 31.

The square root of 57121447 is about 7557.8731796716. The cubic root of 57121447 is about 385.1232460879.

The spelling of 57121447 in words is "fifty-seven million, one hundred twenty-one thousand, four hundred forty-seven".