722658961 has 2 divisors, whose sum is σ = 722658962. Its totient is φ = 722658960.

The previous prime is 722658953. The next prime is 722658973. The reversal of 722658961 is 169856227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657614736 + 65044225 = 25644^2 + 8065^2 .

It is an emirp because it is prime and its reverse (169856227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 722658961 - 2³ = 722658953 is a prime.

It is not a weakly prime, because it can be changed into another prime (722658941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361329480 + 361329481.

It is an arithmetic number, because the mean of its divisors is an integer number (361329481).

Almost surely, 2^722658961 is an apocalyptic number.

It is an amenable number.

722658961 is a deficient number, since it is larger than the sum of its proper divisors (1).

722658961 is an equidigital number, since it uses as much as digits as its factorization.

722658961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 46.

The square root of 722658961 is about 26882.3168830367. The cubic root of 722658961 is about 897.3829161645.

The spelling of 722658961 in words is "seven hundred twenty-two million, six hundred fifty-eight thousand, nine hundred sixty-one".