108561961 has 2 divisors, whose sum is σ = 108561962. Its totient is φ = 108561960.

The previous prime is 108561931. The next prime is 108562009. The reversal of 108561961 is 169165801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108555561 + 6400 = 10419^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 108561961 - 2¹³ = 108553769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 108561961.

It is not a weakly prime, because it can be changed into another prime (108561931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54280980 + 54280981.

It is an arithmetic number, because the mean of its divisors is an integer number (54280981).

Almost surely, 2^108561961 is an apocalyptic number.

It is an amenable number.

108561961 is a deficient number, since it is larger than the sum of its proper divisors (1).

108561961 is an equidigital number, since it uses as much as digits as its factorization.

108561961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 108561961 is about 10419.3071266759. The cubic root of 108561961 is about 477.0448662505.

The spelling of 108561961 in words is "one hundred eight million, five hundred sixty-one thousand, nine hundred sixty-one".