70556641 has 2 divisors, whose sum is σ = 70556642. Its totient is φ = 70556640.

The previous prime is 70556639. The next prime is 70556657. The reversal of 70556641 is 14665507.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68956416 + 1600225 = 8304^2 + 1265^2 .

It is an emirp because it is prime and its reverse (14665507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70556641 - 2¹ = 70556639 is a prime.

Together with 70556639, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 70556597 and 70556606.

It is not a weakly prime, because it can be changed into another prime (70556611) 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, 35278320 + 35278321.

It is an arithmetic number, because the mean of its divisors is an integer number (35278321).

Almost surely, 2^70556641 is an apocalyptic number.

70556641 is the 5313-rd centered pentagonal number.

It is an amenable number.

70556641 is a deficient number, since it is larger than the sum of its proper divisors (1).

70556641 is an equidigital number, since it uses as much as digits as its factorization.

70556641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 70556641 is about 8399.8000571442. The cubic root of 70556641 is about 413.2180643857.

The spelling of 70556641 in words is "seventy million, five hundred fifty-six thousand, six hundred forty-one".