70194821 has 2 divisors, whose sum is σ = 70194822. Its totient is φ = 70194820.

The previous prime is 70194799. The next prime is 70194841. The reversal of 70194821 is 12849107.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48804196 + 21390625 = 6986^2 + 4625^2 .

It is an emirp because it is prime and its reverse (12849107) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70194821 - 2¹⁰ = 70193797 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_4128863 and since 70194821 and 4128863 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70194841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35097410 + 35097411.

It is an arithmetic number, because the mean of its divisors is an integer number (35097411).

Almost surely, 2^70194821 is an apocalyptic number.

It is an amenable number.

70194821 is a deficient number, since it is larger than the sum of its proper divisors (1).

70194821 is an equidigital number, since it uses as much as digits as its factorization.

70194821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 70194821 is about 8378.2349573165. The cubic root of 70194821 is about 412.5105153120.

The spelling of 70194821 in words is "seventy million, one hundred ninety-four thousand, eight hundred twenty-one".