102111780829 has 4 divisors (see below), whose sum is σ = 102414783484. Its totient is φ = 101808778176.

The previous prime is 102111780677. The next prime is 102111780851. The reversal of 102111780829 is 928087111201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 928087111201 = 829 ⋅1119526069.

It can be written as a sum of positive squares in 2 ways, for example, as 21586367929 + 80525412900 = 146923^2 + 283770^2 .

It is a cyclic number.

It is not a de Polignac number, because 102111780829 - 2³³ = 93521846237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102111780791 and 102111780800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111780229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151500822 + ... + 151501495.

It is an arithmetic number, because the mean of its divisors is an integer number (25603695871).

Almost surely, 2^102111780829 is an apocalyptic number.

It is an amenable number.

102111780829 is a deficient number, since it is larger than the sum of its proper divisors (303002655).

102111780829 is an equidigital number, since it uses as much as digits as its factorization.

102111780829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303002654.

The product of its (nonzero) digits is 16128, while the sum is 40.

The spelling of 102111780829 in words is "one hundred two billion, one hundred eleven million, seven hundred eighty thousand, eight hundred twenty-nine".