57491457109 has 2 divisors, whose sum is σ = 57491457110. Its totient is φ = 57491457108.

The previous prime is 57491457103. The next prime is 57491457151. The reversal of 57491457109 is 90175419475.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41007465009 + 16483992100 = 202503^2 + 128390^2 .

It is a cyclic number.

It is not a de Polignac number, because 57491457109 - 2⁹ = 57491456597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57491457103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28745728554 + 28745728555.

It is an arithmetic number, because the mean of its divisors is an integer number (28745728555).

Almost surely, 2^57491457109 is an apocalyptic number.

It is an amenable number.

57491457109 is a deficient number, since it is larger than the sum of its proper divisors (1).

57491457109 is an equidigital number, since it uses as much as digits as its factorization.

57491457109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 52.

The spelling of 57491457109 in words is "fifty-seven billion, four hundred ninety-one million, four hundred fifty-seven thousand, one hundred nine".