108661901 has 2 divisors, whose sum is σ = 108661902. Its totient is φ = 108661900.

The previous prime is 108661897. The next prime is 108661919. The reversal of 108661901 is 109166801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104142025 + 4519876 = 10205^2 + 2126^2 .

It is an emirp because it is prime and its reverse (109166801) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 106199801 and 108991601.

It is a cyclic number.

It is not a de Polignac number, because 108661901 - 2² = 108661897 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108661951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54330950 + 54330951.

It is an arithmetic number, because the mean of its divisors is an integer number (54330951).

Almost surely, 2^108661901 is an apocalyptic number.

It is an amenable number.

108661901 is a deficient number, since it is larger than the sum of its proper divisors (1).

108661901 is an equidigital number, since it uses as much as digits as its factorization.

108661901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 108661901 is about 10424.1019277442. The cubic root of 108661901 is about 477.1912073850.

The spelling of 108661901 in words is "one hundred eight million, six hundred sixty-one thousand, nine hundred one".