721130611 has 2 divisors, whose sum is σ = 721130612. Its totient is φ = 721130610.

The previous prime is 721130609. The next prime is 721130671. The reversal of 721130611 is 116031127.

It is a weak prime.

It is an emirp because it is prime and its reverse (116031127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721130611 - 2¹ = 721130609 is a prime.

Together with 721130609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (721130671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360565305 + 360565306.

It is an arithmetic number, because the mean of its divisors is an integer number (360565306).

Almost surely, 2^721130611 is an apocalyptic number.

721130611 is a deficient number, since it is larger than the sum of its proper divisors (1).

721130611 is an equidigital number, since it uses as much as digits as its factorization.

721130611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 721130611 is about 26853.8751579730. The cubic root of 721130611 is about 896.7498452125.

Adding to 721130611 its reverse (116031127), we get a palindrome (837161738).

The spelling of 721130611 in words is "seven hundred twenty-one million, one hundred thirty thousand, six hundred eleven".