234181809 has 9 divisors (see below), whose sum is σ = 338328939. Its totient is φ = 156090600.

The previous prime is 234181799. The next prime is 234181811. The reversal of 234181809 is 908181432.

The square root of 234181809 is 15303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 91809 + 234090000 = 303^2 + 15300^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 234181809 - 2¹¹ = 234179761 is a prime.

It is a super-2 number, since 2×234181809² = 109682239333024962, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (234181819) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 43359 + ... + 48459.

Almost surely, 2^234181809 is an apocalyptic number.

234181809 is the 15303-rd square number.

234181809 is the 7652-nd centered octagonal number.

It is an amenable number.

234181809 is a deficient number, since it is larger than the sum of its proper divisors (104147130).

234181809 is an frugal number, since it uses more digits than its factorization.

234181809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10208 (or 5104 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The cubic root of 234181809 is about 616.3835675794.

Multiplying 234181809 by its sum of digits (36), we get a square (8430545124 = 91818²).

The spelling of 234181809 in words is "two hundred thirty-four million, one hundred eighty-one thousand, eight hundred nine".