171121988 has 6 divisors (see below), whose sum is σ = 299463486. Its totient is φ = 85560992.

The previous prime is 171121981. The next prime is 171122053. The reversal of 171121988 is 889121171.

It can be written as a sum of positive squares in only one way, i.e., 164660224 + 6461764 = 12832^2 + 2542^2 .

It is not an unprimeable number, because it can be changed into a prime (171121981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21390245 + ... + 21390252.

It is an arithmetic number, because the mean of its divisors is an integer number (49910581).

Almost surely, 2^171121988 is an apocalyptic number.

It is an amenable number.

171121988 is a deficient number, since it is larger than the sum of its proper divisors (128341498).

171121988 is a wasteful number, since it uses less digits than its factorization.

171121988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42780501 (or 42780499 counting only the distinct ones).

The product of its digits is 8064, while the sum is 38.

The square root of 171121988 is about 13081.3603268162. The cubic root of 171121988 is about 555.1818661079.

The spelling of 171121988 in words is "one hundred seventy-one million, one hundred twenty-one thousand, nine hundred eighty-eight".