168211901 has 12 divisors (see below), whose sum is σ = 199118556. Its totient is φ = 141155520.

The previous prime is 168211873. The next prime is 168211909. The reversal of 168211901 is 109112861.

It can be written as a sum of positive squares in 2 ways, for example, as 45024100 + 123187801 = 6710^2 + 11099^2 .

It is a de Polignac number, because none of the positive numbers 2^k-168211901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168211909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51896 + ... + 55041.

It is an arithmetic number, because the mean of its divisors is an integer number (16593213).

Almost surely, 2^168211901 is an apocalyptic number.

168211901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168211901 is a deficient number, since it is larger than the sum of its proper divisors (30906655).

168211901 is a wasteful number, since it uses less digits than its factorization.

168211901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106972 (or 106961 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 168211901 is about 12969.6530794004. The cubic root of 168211901 is about 552.0167293904.

The spelling of 168211901 in words is "one hundred sixty-eight million, two hundred eleven thousand, nine hundred one".