231947865 has 24 divisors (see below), whose sum is σ = 411852168. Its totient is φ = 120687360.

The previous prime is 231947861. The next prime is 231947879. The reversal of 231947865 is 568749132.

It can be written as a sum of positive squares in 4 ways, for example, as 1879641 + 230068224 = 1371^2 + 15168^2 .

It is not a de Polignac number, because 231947865 - 2² = 231947861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 231947865.

It is not an unprimeable number, because it can be changed into a prime (231947861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61014 + ... + 64703.

It is an arithmetic number, because the mean of its divisors is an integer number (17160507).

Almost surely, 2^231947865 is an apocalyptic number.

It is an amenable number.

231947865 is a deficient number, since it is larger than the sum of its proper divisors (179904303).

231947865 is a wasteful number, since it uses less digits than its factorization.

231947865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125769 (or 125766 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 231947865 is about 15229.8347003505. The cubic root of 231947865 is about 614.4173343218.

The spelling of 231947865 in words is "two hundred thirty-one million, nine hundred forty-seven thousand, eight hundred sixty-five".