870868181 has 2 divisors, whose sum is σ = 870868182. Its totient is φ = 870868180.

The previous prime is 870868177. The next prime is 870868237. The reversal of 870868181 is 181868078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 590004100 + 280864081 = 24290^2 + 16759^2 .

It is a cyclic number.

It is not a de Polignac number, because 870868181 - 2² = 870868177 is a prime.

It is a super-2 number, since 2×870868181² = 1516822777356497522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870868111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435434090 + 435434091.

It is an arithmetic number, because the mean of its divisors is an integer number (435434091).

Almost surely, 2^870868181 is an apocalyptic number.

It is an amenable number.

870868181 is a deficient number, since it is larger than the sum of its proper divisors (1).

870868181 is an equidigital number, since it uses as much as digits as its factorization.

870868181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 47.

The square root of 870868181 is about 29510.4757840330. The cubic root of 870868181 is about 954.9577134680.

The spelling of 870868181 in words is "eight hundred seventy million, eight hundred sixty-eight thousand, one hundred eighty-one".