108281993261 has 4 divisors (see below), whose sum is σ = 116611377372. Its totient is φ = 99952609152.

The previous prime is 108281993257. The next prime is 108281993269. The reversal of 108281993261 is 162399182801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162399182801 = 101 ⋅1607912701.

It can be written as a sum of positive squares in 2 ways, for example, as 9752550025 + 98529443236 = 98755^2 + 313894^2 .

It is a cyclic number.

It is not a de Polignac number, because 108281993261 - 2² = 108281993257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108281993269) 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, 4164692036 + ... + 4164692061.

It is an arithmetic number, because the mean of its divisors is an integer number (29152844343).

Almost surely, 2^108281993261 is an apocalyptic number.

It is an amenable number.

108281993261 is a deficient number, since it is larger than the sum of its proper divisors (8329384111).

108281993261 is an equidigital number, since it uses as much as digits as its factorization.

108281993261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8329384110.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 108281993261 in words is "one hundred eight billion, two hundred eighty-one million, nine hundred ninety-three thousand, two hundred sixty-one".