231563121 has 16 divisors (see below), whose sum is σ = 317123520. Its totient is φ = 150209280.

The previous prime is 231563119. The next prime is 231563159. The reversal of 231563121 is 121365132.

It is not a de Polignac number, because 231563121 - 2¹ = 231563119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231563091 and 231563100.

It is not an unprimeable number, because it can be changed into a prime (231563921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48006 + ... + 52608.

It is an arithmetic number, because the mean of its divisors is an integer number (19820220).

Almost surely, 2^231563121 is an apocalyptic number.

It is an amenable number.

231563121 is a deficient number, since it is larger than the sum of its proper divisors (85560399).

231563121 is a wasteful number, since it uses less digits than its factorization.

231563121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056.

The product of its digits is 1080, while the sum is 24.

The square root of 231563121 is about 15217.1981980915. The cubic root of 231563121 is about 614.0774243030.

The spelling of 231563121 in words is "two hundred thirty-one million, five hundred sixty-three thousand, one hundred twenty-one".