231307261 has 2 divisors, whose sum is σ = 231307262. Its totient is φ = 231307260.

The previous prime is 231307229. The next prime is 231307283. The reversal of 231307261 is 162703132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206496900 + 24810361 = 14370^2 + 4981^2 .

It is a cyclic number.

It is not a de Polignac number, because 231307261 - 2⁵ = 231307229 is a prime.

It is equal to p_12710554 and since 231307261 and 12710554 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231307361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115653630 + 115653631.

It is an arithmetic number, because the mean of its divisors is an integer number (115653631).

Almost surely, 2^231307261 is an apocalyptic number.

It is an amenable number.

231307261 is a deficient number, since it is larger than the sum of its proper divisors (1).

231307261 is an equidigital number, since it uses as much as digits as its factorization.

231307261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 231307261 is about 15208.7889392943. The cubic root of 231307261 is about 613.8511710141.

The spelling of 231307261 in words is "two hundred thirty-one million, three hundred seven thousand, two hundred sixty-one".