70519681 has 2 divisors, whose sum is σ = 70519682. Its totient is φ = 70519680.

The previous prime is 70519667. The next prime is 70519703. The reversal of 70519681 is 18691507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 9054081 = 7840^2 + 3009^2 .

It is an emirp because it is prime and its reverse (18691507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70519681 - 2⁵ = 70519649 is a prime.

It is a super-2 number, since 2×70519681² = 9946050816683522, 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 70519681.

It is not a weakly prime, because it can be changed into another prime (70519601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35259840 + 35259841.

It is an arithmetic number, because the mean of its divisors is an integer number (35259841).

Almost surely, 2^70519681 is an apocalyptic number.

It is an amenable number.

70519681 is a deficient number, since it is larger than the sum of its proper divisors (1).

70519681 is an equidigital number, since it uses as much as digits as its factorization.

70519681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 70519681 is about 8397.5997165857. The cubic root of 70519681 is about 413.1458991627.

The spelling of 70519681 in words is "seventy million, five hundred nineteen thousand, six hundred eighty-one".