168891253 has 2 divisors, whose sum is σ = 168891254. Its totient is φ = 168891252.

The previous prime is 168891241. The next prime is 168891293. The reversal of 168891253 is 352198861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132204004 + 36687249 = 11498^2 + 6057^2 .

It is a cyclic number.

It is not a de Polignac number, because 168891253 - 2⁹ = 168890741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168891223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84445626 + 84445627.

It is an arithmetic number, because the mean of its divisors is an integer number (84445627).

Almost surely, 2^168891253 is an apocalyptic number.

It is an amenable number.

168891253 is a deficient number, since it is larger than the sum of its proper divisors (1).

168891253 is an equidigital number, since it uses as much as digits as its factorization.

168891253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 43.

The square root of 168891253 is about 12995.8167500161. The cubic root of 168891253 is about 552.7588686103.

The spelling of 168891253 in words is "one hundred sixty-eight million, eight hundred ninety-one thousand, two hundred fifty-three".