721411651 has 2 divisors, whose sum is σ = 721411652. Its totient is φ = 721411650.

The previous prime is 721411597. The next prime is 721411657. The reversal of 721411651 is 156114127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721411651 - 2⁹ = 721411139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (721411657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360705825 + 360705826.

It is an arithmetic number, because the mean of its divisors is an integer number (360705826).

Almost surely, 2^721411651 is an apocalyptic number.

721411651 is a deficient number, since it is larger than the sum of its proper divisors (1).

721411651 is an equidigital number, since it uses as much as digits as its factorization.

721411651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 721411651 is about 26859.1074125705. The cubic root of 721411651 is about 896.8663242711.

Adding to 721411651 its reverse (156114127), we get a palindrome (877525778).

The spelling of 721411651 in words is "seven hundred twenty-one million, four hundred eleven thousand, six hundred fifty-one".