231400161 has 12 divisors (see below), whose sum is σ = 334533888. Its totient is φ = 154133304.

The previous prime is 231400153. The next prime is 231400177. The reversal of 231400161 is 161004132.

It is a happy number.

It is not a de Polignac number, because 231400161 - 2³ = 231400153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231400121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496 + ... + 21518.

It is an arithmetic number, because the mean of its divisors is an integer number (27877824).

Almost surely, 2^231400161 is an apocalyptic number.

It is an amenable number.

231400161 is a deficient number, since it is larger than the sum of its proper divisors (103133727).

231400161 is a wasteful number, since it uses less digits than its factorization.

231400161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22252 (or 22249 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 231400161 is about 15211.8427877756. The cubic root of 231400161 is about 613.9333404204.

Adding to 231400161 its reverse (161004132), we get a palindrome (392404293).

The spelling of 231400161 in words is "two hundred thirty-one million, four hundred thousand, one hundred sixty-one".