1001200838857 has 2 divisors, whose sum is σ = 1001200838858. Its totient is φ = 1001200838856.

The previous prime is 1001200838851. The next prime is 1001200838879. The reversal of 1001200838857 is 7588380021001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998918292681 + 2282546176 = 999459^2 + 47776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001200838857 - 2²³ = 1001192450249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001200838851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500600419428 + 500600419429.

It is an arithmetic number, because the mean of its divisors is an integer number (500600419429).

Almost surely, 2^{1001200838857} is an apocalyptic number.

It is an amenable number.

1001200838857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001200838857 is an equidigital number, since it uses as much as digits as its factorization.

1001200838857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 43.

Adding to 1001200838857 its reverse (7588380021001), we get a palindrome (8589580859858).

The spelling of 1001200838857 in words is "one trillion, one billion, two hundred million, eight hundred thirty-eight thousand, eight hundred fifty-seven".