70521413 has 2 divisors, whose sum is σ = 70521414. Its totient is φ = 70521412.

The previous prime is 70521391. The next prime is 70521439. The reversal of 70521413 is 31412507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41770369 + 28751044 = 6463^2 + 5362^2 .

It is a cyclic number.

It is not a de Polignac number, because 70521413 - 2⁶ = 70521349 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70521443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35260706 + 35260707.

It is an arithmetic number, because the mean of its divisors is an integer number (35260707).

Almost surely, 2^70521413 is an apocalyptic number.

It is an amenable number.

70521413 is a deficient number, since it is larger than the sum of its proper divisors (1).

70521413 is an equidigital number, since it uses as much as digits as its factorization.

70521413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 70521413 is about 8397.7028406583. The cubic root of 70521413 is about 413.1492814943.

The spelling of 70521413 in words is "seventy million, five hundred twenty-one thousand, four hundred thirteen".