231261665 has 8 divisors (see below), whose sum is σ = 289579968. Its totient is φ = 176965360.

The previous prime is 231261637. The next prime is 231261733. The reversal of 231261665 is 566162132.

231261665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 231261665 - 2⁶ = 231261601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1005371 + ... + 1005600.

It is an arithmetic number, because the mean of its divisors is an integer number (36197496).

Almost surely, 2^231261665 is an apocalyptic number.

It is an amenable number.

231261665 is a deficient number, since it is larger than the sum of its proper divisors (58318303).

231261665 is a wasteful number, since it uses less digits than its factorization.

231261665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010999.

The product of its digits is 12960, while the sum is 32.

The square root of 231261665 is about 15207.2898637463. The cubic root of 231261665 is about 613.8108336187.

The spelling of 231261665 in words is "two hundred thirty-one million, two hundred sixty-one thousand, six hundred sixty-five".