719945021 has 2 divisors, whose sum is σ = 719945022. Its totient is φ = 719945020.

The previous prime is 719944999. The next prime is 719945027. The reversal of 719945021 is 120549917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 705964900 + 13980121 = 26570^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 719945021 - 2¹⁸ = 719682877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (719945027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359972510 + 359972511.

It is an arithmetic number, because the mean of its divisors is an integer number (359972511).

Almost surely, 2^719945021 is an apocalyptic number.

It is an amenable number.

719945021 is a deficient number, since it is larger than the sum of its proper divisors (1).

719945021 is an equidigital number, since it uses as much as digits as its factorization.

719945021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 719945021 is about 26831.7912372618. The cubic root of 719945021 is about 896.2581354760.

The spelling of 719945021 in words is "seven hundred nineteen million, nine hundred forty-five thousand, twenty-one".