99870857 has 2 divisors, whose sum is σ = 99870858. Its totient is φ = 99870856.

The previous prime is 99870833. The next prime is 99870877. The reversal of 99870857 is 75807899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49970761 + 49900096 = 7069^2 + 7064^2 .

It is a cyclic number.

It is not a de Polignac number, because 99870857 - 2¹⁴ = 99854473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99870799 and 99870808.

It is not a weakly prime, because it can be changed into another prime (99870877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935428 + 49935429.

It is an arithmetic number, because the mean of its divisors is an integer number (49935429).

Almost surely, 2^99870857 is an apocalyptic number.

It is an amenable number.

99870857 is a deficient number, since it is larger than the sum of its proper divisors (1).

99870857 is an equidigital number, since it uses as much as digits as its factorization.

99870857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 99870857 is about 9993.5407639135. The cubic root of 99870857 is about 463.9589877172.

The spelling of 99870857 in words is "ninety-nine million, eight hundred seventy thousand, eight hundred fifty-seven".