231621265 has 8 divisors (see below), whose sum is σ = 278108928. Its totient is φ = 185188080.

The previous prime is 231621253. The next prime is 231621281. The reversal of 231621265 is 562126132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231621265 - 2¹¹ = 231619217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3591 + ... + 21820.

It is an arithmetic number, because the mean of its divisors is an integer number (34763616).

Almost surely, 2^231621265 is an apocalyptic number.

It is an amenable number.

231621265 is a deficient number, since it is larger than the sum of its proper divisors (46487663).

231621265 is a wasteful number, since it uses less digits than its factorization.

231621265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27239.

The product of its digits is 4320, while the sum is 28.

The square root of 231621265 is about 15219.1085481378. The cubic root of 231621265 is about 614.1288169566.

Adding to 231621265 its reverse (562126132), we get a palindrome (793747397).

The spelling of 231621265 in words is "two hundred thirty-one million, six hundred twenty-one thousand, two hundred sixty-five".