108781961 has 4 divisors (see below), whose sum is σ = 111722052. Its totient is φ = 105841872.

The previous prime is 108781943. The next prime is 108781969. The reversal of 108781961 is 169187801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169187801 = 31 ⋅5457671.

It can be written as a sum of positive squares in 2 ways, for example, as 81793936 + 26988025 = 9044^2 + 5195^2 .

It is a cyclic number.

It is not a de Polignac number, because 108781961 - 2¹⁰ = 108780937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108781969) 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, 1469990 + ... + 1470063.

It is an arithmetic number, because the mean of its divisors is an integer number (27930513).

Almost surely, 2^108781961 is an apocalyptic number.

It is an amenable number.

108781961 is a deficient number, since it is larger than the sum of its proper divisors (2940091).

108781961 is an equidigital number, since it uses as much as digits as its factorization.

108781961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940090.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 108781961 is about 10429.8591073897. The cubic root of 108781961 is about 477.3668914361.

The spelling of 108781961 in words is "one hundred eight million, seven hundred eighty-one thousand, nine hundred sixty-one".