168949771 has 4 divisors (see below), whose sum is σ = 168978544. Its totient is φ = 168921000.

The previous prime is 168949769. The next prime is 168949777. The reversal of 168949771 is 177949861.

It is a semiprime because it is the product of two primes.

It is a 3-Lehmer number, since φ(168949771) divides (168949771-1)³.

It is a cyclic number.

It is not a de Polignac number, because 168949771 - 2¹ = 168949769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168949777) 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, 2055 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (42244636).

Almost surely, 2^168949771 is an apocalyptic number.

168949771 is the 8221-st heptagonal number.

168949771 is a deficient number, since it is larger than the sum of its proper divisors (28773).

168949771 is an equidigital number, since it uses as much as digits as its factorization.

168949771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28772.

The product of its digits is 762048, while the sum is 52.

The square root of 168949771 is about 12998.0679718180. The cubic root of 168949771 is about 552.8227018122.

The spelling of 168949771 in words is "one hundred sixty-eight million, nine hundred forty-nine thousand, seven hundred seventy-one".