70811813 has 2 divisors, whose sum is σ = 70811814. Its totient is φ = 70811812.

The previous prime is 70811809. The next prime is 70811849. The reversal of 70811813 is 31811807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68674369 + 2137444 = 8287^2 + 1462^2 .

It is an emirp because it is prime and its reverse (31811807) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70811813 - 2² = 70811809 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70811113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35405906 + 35405907.

It is an arithmetic number, because the mean of its divisors is an integer number (35405907).

Almost surely, 2^70811813 is an apocalyptic number.

It is an amenable number.

70811813 is a deficient number, since it is larger than the sum of its proper divisors (1).

70811813 is an equidigital number, since it uses as much as digits as its factorization.

70811813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 70811813 is about 8414.9755198693. The cubic root of 70811813 is about 413.7156070754.

It can be divided in two parts, 708 and 11813, that added together give a palindrome (12521).

The spelling of 70811813 in words is "seventy million, eight hundred eleven thousand, eight hundred thirteen".