70630421 has 2 divisors, whose sum is σ = 70630422. Its totient is φ = 70630420.

The previous prime is 70630409. The next prime is 70630423. The reversal of 70630421 is 12403607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 16313521 = 7370^2 + 4039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70630421 is a prime.

Together with 70630423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70630423) 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, 35315210 + 35315211.

It is an arithmetic number, because the mean of its divisors is an integer number (35315211).

Almost surely, 2^70630421 is an apocalyptic number.

It is an amenable number.

70630421 is a deficient number, since it is larger than the sum of its proper divisors (1).

70630421 is an equidigital number, since it uses as much as digits as its factorization.

70630421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 70630421 is about 8404.1906808449. The cubic root of 70630421 is about 413.3620461468.

The spelling of 70630421 in words is "seventy million, six hundred thirty thousand, four hundred twenty-one".