719451721 has 2 divisors, whose sum is σ = 719451722. Its totient is φ = 719451720.

The previous prime is 719451709. The next prime is 719451779. The reversal of 719451721 is 127154917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689640121 + 29811600 = 26261^2 + 5460^2 .

It is a cyclic number.

It is not a de Polignac number, because 719451721 - 2⁹ = 719451209 is a prime.

It is a super-2 number, since 2×719451721² = 1035221557699723682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (719457721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359725860 + 359725861.

It is an arithmetic number, because the mean of its divisors is an integer number (359725861).

Almost surely, 2^719451721 is an apocalyptic number.

It is an amenable number.

719451721 is a deficient number, since it is larger than the sum of its proper divisors (1).

719451721 is an equidigital number, since it uses as much as digits as its factorization.

719451721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 719451721 is about 26822.5972083242. The cubic root of 719451721 is about 896.0533859726.

The spelling of 719451721 in words is "seven hundred nineteen million, four hundred fifty-one thousand, seven hundred twenty-one".