173531989 has 2 divisors, whose sum is σ = 173531990. Its totient is φ = 173531988.

The previous prime is 173531983. The next prime is 173531993. The reversal of 173531989 is 989135371.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157929489 + 15602500 = 12567^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 173531989 - 2⁵ = 173531957 is a prime.

It is a super-2 number, since 2×173531989² = 60226702412592242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173531983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86765994 + 86765995.

It is an arithmetic number, because the mean of its divisors is an integer number (86765995).

Almost surely, 2^173531989 is an apocalyptic number.

It is an amenable number.

173531989 is a deficient number, since it is larger than the sum of its proper divisors (1).

173531989 is an equidigital number, since it uses as much as digits as its factorization.

173531989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 173531989 is about 13173.1541021883. The cubic root of 173531989 is about 557.7760317404.

The spelling of 173531989 in words is "one hundred seventy-three million, five hundred thirty-one thousand, nine hundred eighty-nine".