100800857 has 2 divisors, whose sum is σ = 100800858. Its totient is φ = 100800856.

The previous prime is 100800841. The next prime is 100800907. The reversal of 100800857 is 758008001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93915481 + 6885376 = 9691^2 + 2624^2 .

It is a cyclic number.

It is not a de Polignac number, because 100800857 - 2⁴ = 100800841 is a prime.

It is not a weakly prime, because it can be changed into another prime (100800457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50400428 + 50400429.

It is an arithmetic number, because the mean of its divisors is an integer number (50400429).

Almost surely, 2^100800857 is an apocalyptic number.

It is an amenable number.

100800857 is a deficient number, since it is larger than the sum of its proper divisors (1).

100800857 is an equidigital number, since it uses as much as digits as its factorization.

100800857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 100800857 is about 10039.9629979398. The cubic root of 100800857 is about 465.3946732087.

Adding to 100800857 its reverse (758008001), we get a palindrome (858808858).

The spelling of 100800857 in words is "one hundred million, eight hundred thousand, eight hundred fifty-seven".