57191140861 has 2 divisors, whose sum is σ = 57191140862. Its totient is φ = 57191140860.

The previous prime is 57191140823. The next prime is 57191140873. The reversal of 57191140861 is 16804119175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56411000100 + 780140761 = 237510^2 + 27931^2 .

It is a cyclic number.

It is not a de Polignac number, because 57191140861 - 2¹¹ = 57191138813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57191140261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28595570430 + 28595570431.

It is an arithmetic number, because the mean of its divisors is an integer number (28595570431).

Almost surely, 2^57191140861 is an apocalyptic number.

It is an amenable number.

57191140861 is a deficient number, since it is larger than the sum of its proper divisors (1).

57191140861 is an equidigital number, since it uses as much as digits as its factorization.

57191140861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 43.

The spelling of 57191140861 in words is "fifty-seven billion, one hundred ninety-one million, one hundred forty thousand, eight hundred sixty-one".