781250000099 has 2 divisors, whose sum is σ = 781250000100. Its totient is φ = 781250000098.

The previous prime is 781250000087. The next prime is 781250000143. The reversal of 781250000099 is 990000052187.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781250000099 is a prime.

It is a super-2 number, since 2×781250000099² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781250000029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390625000049 + 390625000050.

It is an arithmetic number, because the mean of its divisors is an integer number (390625000050).

Almost surely, 2^781250000099 is an apocalyptic number.

781250000099 is a deficient number, since it is larger than the sum of its proper divisors (1).

781250000099 is an equidigital number, since it uses as much as digits as its factorization.

781250000099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 781250000099 in words is "seven hundred eighty-one billion, two hundred fifty million, ninety-nine", and thus it is an aban number.