721449097 has 2 divisors, whose sum is σ = 721449098. Its totient is φ = 721449096.

The previous prime is 721449089. The next prime is 721449103. The reversal of 721449097 is 790944127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717221961 + 4227136 = 26781^2 + 2056^2 .

It is an emirp because it is prime and its reverse (790944127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721449097 - 2³ = 721449089 is a prime.

It is not a weakly prime, because it can be changed into another prime (721449007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360724548 + 360724549.

It is an arithmetic number, because the mean of its divisors is an integer number (360724549).

Almost surely, 2^721449097 is an apocalyptic number.

It is an amenable number.

721449097 is a deficient number, since it is larger than the sum of its proper divisors (1).

721449097 is an equidigital number, since it uses as much as digits as its factorization.

721449097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 721449097 is about 26859.8044855133. The cubic root of 721449097 is about 896.8818417524.

The spelling of 721449097 in words is "seven hundred twenty-one million, four hundred forty-nine thousand, ninety-seven".