721005041 has 2 divisors, whose sum is σ = 721005042. Its totient is φ = 721005040.

The previous prime is 721005031. The next prime is 721005091. The reversal of 721005041 is 140500127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570206641 + 150798400 = 23879^2 + 12280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721005041 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (721005031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360502520 + 360502521.

It is an arithmetic number, because the mean of its divisors is an integer number (360502521).

Almost surely, 2^721005041 is an apocalyptic number.

It is an amenable number.

721005041 is a deficient number, since it is larger than the sum of its proper divisors (1).

721005041 is an equidigital number, since it uses as much as digits as its factorization.

721005041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 721005041 is about 26851.5370323563. The cubic root of 721005041 is about 896.6977920371.

Adding to 721005041 its reverse (140500127), we get a palindrome (861505168).

The spelling of 721005041 in words is "seven hundred twenty-one million, five thousand, forty-one".