70306921 has 2 divisors, whose sum is σ = 70306922. Its totient is φ = 70306920.

The previous prime is 70306913. The next prime is 70306939. The reversal of 70306921 is 12960307.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55950400 + 14356521 = 7480^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 70306921 - 2³ = 70306913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70306921.

It is not a weakly prime, because it can be changed into another prime (70306981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35153460 + 35153461.

It is an arithmetic number, because the mean of its divisors is an integer number (35153461).

Almost surely, 2^70306921 is an apocalyptic number.

It is an amenable number.

70306921 is a deficient number, since it is larger than the sum of its proper divisors (1).

70306921 is an equidigital number, since it uses as much as digits as its factorization.

70306921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 70306921 is about 8384.9222417384. The cubic root of 70306921 is about 412.7299894070.

The spelling of 70306921 in words is "seventy million, three hundred six thousand, nine hundred twenty-one".