815750099 has 2 divisors, whose sum is σ = 815750100. Its totient is φ = 815750098.

The previous prime is 815750087. The next prime is 815750147. The reversal of 815750099 is 990057518.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815750099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (815750029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407875049 + 407875050.

It is an arithmetic number, because the mean of its divisors is an integer number (407875050).

Almost surely, 2^815750099 is an apocalyptic number.

815750099 is a deficient number, since it is larger than the sum of its proper divisors (1).

815750099 is an equidigital number, since it uses as much as digits as its factorization.

815750099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 815750099 is about 28561.3392368075. The cubic root of 815750099 is about 934.3703421713.

The spelling of 815750099 in words is "eight hundred fifteen million, seven hundred fifty thousand, ninety-nine".