70806871 has 2 divisors, whose sum is σ = 70806872. Its totient is φ = 70806870.

The previous prime is 70806859. The next prime is 70806881. The reversal of 70806871 is 17860807.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17860807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70806871 - 2⁵ = 70806839 is a prime.

It is a super-2 number, since 2×70806871² = 10027225961621282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 70806871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70806881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35403435 + 35403436.

It is an arithmetic number, because the mean of its divisors is an integer number (35403436).

Almost surely, 2^70806871 is an apocalyptic number.

70806871 is a deficient number, since it is larger than the sum of its proper divisors (1).

70806871 is an equidigital number, since it uses as much as digits as its factorization.

70806871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 70806871 is about 8414.6818715861. The cubic root of 70806871 is about 413.7059823625.

The spelling of 70806871 in words is "seventy million, eight hundred six thousand, eight hundred seventy-one".