720557099 has 2 divisors, whose sum is σ = 720557100. Its totient is φ = 720557098.

The previous prime is 720557093. The next prime is 720557209. The reversal of 720557099 is 990755027.

It is a weak prime.

It is an emirp because it is prime and its reverse (990755027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720557099 - 2²⁸ = 452121643 is a prime.

It is not a weakly prime, because it can be changed into another prime (720557093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360278549 + 360278550.

It is an arithmetic number, because the mean of its divisors is an integer number (360278550).

Almost surely, 2^720557099 is an apocalyptic number.

720557099 is a deficient number, since it is larger than the sum of its proper divisors (1).

720557099 is an equidigital number, since it uses as much as digits as its factorization.

720557099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 720557099 is about 26843.1946496687. The cubic root of 720557099 is about 896.5120550956.

The spelling of 720557099 in words is "seven hundred twenty million, five hundred fifty-seven thousand, ninety-nine".