70116521 has 2 divisors, whose sum is σ = 70116522. Its totient is φ = 70116520.

The previous prime is 70116503. The next prime is 70116559. The reversal of 70116521 is 12561107.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69538921 + 577600 = 8339^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 70116521 - 2²² = 65922217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (70176521) 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, 35058260 + 35058261.

It is an arithmetic number, because the mean of its divisors is an integer number (35058261).

Almost surely, 2^70116521 is an apocalyptic number.

It is an amenable number.

70116521 is a deficient number, since it is larger than the sum of its proper divisors (1).

70116521 is an equidigital number, since it uses as much as digits as its factorization.

70116521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 70116521 is about 8373.5608315698. The cubic root of 70116521 is about 412.3570776365.

Adding to 70116521 its reverse (12561107), we get a palindrome (82677628).

The spelling of 70116521 in words is "seventy million, one hundred sixteen thousand, five hundred twenty-one".