719540917 has 2 divisors, whose sum is σ = 719540918. Its totient is φ = 719540916.

The previous prime is 719540839. The next prime is 719540959. The reversal of 719540917 is 719045917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 585930436 + 133610481 = 24206^2 + 11559^2 .

It is an emirp because it is prime and its reverse (719045917) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-719540917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (719540977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359770458 + 359770459.

It is an arithmetic number, because the mean of its divisors is an integer number (359770459).

Almost surely, 2^719540917 is an apocalyptic number.

It is an amenable number.

719540917 is a deficient number, since it is larger than the sum of its proper divisors (1).

719540917 is an equidigital number, since it uses as much as digits as its factorization.

719540917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 43.

The square root of 719540917 is about 26824.2598593139. The cubic root of 719540917 is about 896.0904146676.

The spelling of 719540917 in words is "seven hundred nineteen million, five hundred forty thousand, nine hundred seventeen".