70847869 has 2 divisors, whose sum is σ = 70847870. Its totient is φ = 70847868.

The previous prime is 70847867. The next prime is 70847873. The reversal of 70847869 is 96874807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40487769 + 30360100 = 6363^2 + 5510^2 .

It is an emirp because it is prime and its reverse (96874807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70847869 - 2¹ = 70847867 is a prime.

It is a super-2 number, since 2×70847869² = 10038841083682322, which contains 22 as substring.

Together with 70847867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70847867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35423934 + 35423935.

It is an arithmetic number, because the mean of its divisors is an integer number (35423935).

Almost surely, 2^70847869 is an apocalyptic number.

It is an amenable number.

70847869 is a deficient number, since it is larger than the sum of its proper divisors (1).

70847869 is an equidigital number, since it uses as much as digits as its factorization.

70847869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 70847869 is about 8417.1176182824. The cubic root of 70847869 is about 413.7858138116.

The spelling of 70847869 in words is "seventy million, eight hundred forty-seven thousand, eight hundred sixty-nine".