70821313 has 2 divisors, whose sum is σ = 70821314. Its totient is φ = 70821312.

The previous prime is 70821263. The next prime is 70821383. The reversal of 70821313 is 31312807.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54272689 + 16548624 = 7367^2 + 4068^2 .

It is a cyclic number.

It is not a de Polignac number, because 70821313 - 2⁹ = 70820801 is a prime.

It is not a weakly prime, because it can be changed into another prime (70821383) 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, 35410656 + 35410657.

It is an arithmetic number, because the mean of its divisors is an integer number (35410657).

Almost surely, 2^70821313 is an apocalyptic number.

It is an amenable number.

70821313 is a deficient number, since it is larger than the sum of its proper divisors (1).

70821313 is an equidigital number, since it uses as much as digits as its factorization.

70821313 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 25.

The square root of 70821313 is about 8415.5399707921. The cubic root of 70821313 is about 413.7341073903.

The spelling of 70821313 in words is "seventy million, eight hundred twenty-one thousand, three hundred thirteen".