231085549 has 2 divisors, whose sum is σ = 231085550. Its totient is φ = 231085548.

The previous prime is 231085523. The next prime is 231085571. The reversal of 231085549 is 945580132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166797225 + 64288324 = 12915^2 + 8018^2 .

It is a cyclic number.

It is not a de Polignac number, because 231085549 - 2¹⁵ = 231052781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231085579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115542774 + 115542775.

It is an arithmetic number, because the mean of its divisors is an integer number (115542775).

Almost surely, 2^231085549 is an apocalyptic number.

It is an amenable number.

231085549 is a deficient number, since it is larger than the sum of its proper divisors (1).

231085549 is an equidigital number, since it uses as much as digits as its factorization.

231085549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 231085549 is about 15201.4982485280. The cubic root of 231085549 is about 613.6549793373.

The spelling of 231085549 in words is "two hundred thirty-one million, eighty-five thousand, five hundred forty-nine".