781783135099 has 2 divisors, whose sum is σ = 781783135100. Its totient is φ = 781783135098.

The previous prime is 781783135073. The next prime is 781783135103. The reversal of 781783135099 is 990531387187.

It is a strong prime.

It is an emirp because it is prime and its reverse (990531387187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781783135099 is a prime.

It is a super-2 number, since 2×781783135099² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781783135009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390891567549 + 390891567550.

It is an arithmetic number, because the mean of its divisors is an integer number (390891567550).

Almost surely, 2^781783135099 is an apocalyptic number.

781783135099 is a deficient number, since it is larger than the sum of its proper divisors (1).

781783135099 is an equidigital number, since it uses as much as digits as its factorization.

781783135099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 781783135099 in words is "seven hundred eighty-one billion, seven hundred eighty-three million, one hundred thirty-five thousand, ninety-nine".