70805881 has 2 divisors, whose sum is σ = 70805882. Its totient is φ = 70805880.

The previous prime is 70805857. The next prime is 70805897. The reversal of 70805881 is 18850807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49829481 + 20976400 = 7059^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 70805881 - 2¹¹ = 70803833 is a prime.

It is a super-2 number, since 2×70805881² = 10026945568372322, 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 70805881.

It is not a weakly prime, because it can be changed into another prime (70805851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35402940 + 35402941.

It is an arithmetic number, because the mean of its divisors is an integer number (35402941).

Almost surely, 2^70805881 is an apocalyptic number.

It is an amenable number.

70805881 is a deficient number, since it is larger than the sum of its proper divisors (1).

70805881 is an equidigital number, since it uses as much as digits as its factorization.

70805881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 70805881 is about 8414.6230456272. The cubic root of 70805881 is about 413.7040542501.

The spelling of 70805881 in words is "seventy million, eight hundred five thousand, eight hundred eighty-one".