231237261 has 10 divisors (see below), whose sum is σ = 345428622. Its totient is φ = 154158120.

The previous prime is 231237241. The next prime is 231237263. The reversal of 231237261 is 162732132.

231237261 is a `hidden beast` number, since 231 + 2 + 372 + 61 = 666.

231237261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 135001161 + 96236100 = 11619^2 + 9810^2 .

It is not a de Polignac number, because 231237261 - 2¹⁰ = 231236237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231237263) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1427310 + ... + 1427471.

Almost surely, 2^231237261 is an apocalyptic number.

It is an amenable number.

231237261 is a deficient number, since it is larger than the sum of its proper divisors (114191361).

231237261 is an equidigital number, since it uses as much as digits as its factorization.

231237261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854793 (or 2854784 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 231237261 is about 15206.4874642371. The cubic root of 231237261 is about 613.7892419634.

Adding to 231237261 its reverse (162732132), we get a palindrome (393969393).

The spelling of 231237261 in words is "two hundred thirty-one million, two hundred thirty-seven thousand, two hundred sixty-one".