70299721 has 2 divisors, whose sum is σ = 70299722. Its totient is φ = 70299720.

The previous prime is 70299703. The next prime is 70299731. The reversal of 70299721 is 12799207.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67059721 + 3240000 = 8189^2 + 1800^2 .

It is an emirp because it is prime and its reverse (12799207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70299721 - 2⁵ = 70299689 is a prime.

It is not a weakly prime, because it can be changed into another prime (70299731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35149860 + 35149861.

It is an arithmetic number, because the mean of its divisors is an integer number (35149861).

Almost surely, 2^70299721 is an apocalyptic number.

It is an amenable number.

70299721 is a deficient number, since it is larger than the sum of its proper divisors (1).

70299721 is an equidigital number, since it uses as much as digits as its factorization.

70299721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 70299721 is about 8384.4928886606. The cubic root of 70299721 is about 412.7158999578.

The spelling of 70299721 in words is "seventy million, two hundred ninety-nine thousand, seven hundred twenty-one".