102298999681 has 4 divisors (see below), whose sum is σ = 102299645700. Its totient is φ = 102298353664.

The previous prime is 102298999679. The next prime is 102298999703. The reversal of 102298999681 is 186999892201.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186999892201 = 133379 ⋅1402019.

It can be written as a sum of positive squares in 2 ways, for example, as 29942841600 + 72356158081 = 173040^2 + 268991^2 .

It is a cyclic number.

It is not a de Polignac number, because 102298999681 - 2¹ = 102298999679 is a prime.

It is a super-2 number, since 2×102298999681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102298999601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93825 + ... + 461953.

It is an arithmetic number, because the mean of its divisors is an integer number (25574911425).

Almost surely, 2^102298999681 is an apocalyptic number.

It is an amenable number.

102298999681 is a deficient number, since it is larger than the sum of its proper divisors (646019).

102298999681 is an equidigital number, since it uses as much as digits as its factorization.

102298999681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646018.

The product of its (nonzero) digits is 10077696, while the sum is 64.

The spelling of 102298999681 in words is "one hundred two billion, two hundred ninety-eight million, nine hundred ninety-nine thousand, six hundred eighty-one".