970721 has 2 divisors, whose sum is σ = 970722. Its totient is φ = 970720.

The previous prime is 970699. The next prime is 970747. The reversal of 970721 is 127079.

It is an a-pointer prime, because the next prime (970747) can be obtained adding 970721 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541696 + 429025 = 736^2 + 655^2 .

It is an emirp because it is prime and its reverse (127079) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 970721 - 2⁶ = 970657 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 970721.

It is not a weakly prime, because it can be changed into another prime (970421) 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, 485360 + 485361.

It is an arithmetic number, because the mean of its divisors is an integer number (485361).

2⁹⁷⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

970721 is a deficient number, since it is larger than the sum of its proper divisors (1).

970721 is an equidigital number, since it uses as much as digits as its factorization.

970721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 970721 is about 985.2517444796. The cubic root of 970721 is about 99.0143501968.

The spelling of 970721 in words is "nine hundred seventy thousand, seven hundred twenty-one".