231661465 has 24 divisors (see below), whose sum is σ = 342409032. Its totient is φ = 149506560.

The previous prime is 231661447. The next prime is 231661501. The reversal of 231661465 is 564166132.

It can be written as a sum of positive squares in 4 ways, for example, as 9144576 + 222516889 = 3024^2 + 14917^2 .

It is not a de Polignac number, because 231661465 - 2¹⁵ = 231628697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231661465.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23646 + ... + 31975.

It is an arithmetic number, because the mean of its divisors is an integer number (14267043).

Almost surely, 2^231661465 is an apocalyptic number.

It is an amenable number.

231661465 is a deficient number, since it is larger than the sum of its proper divisors (110747567).

231661465 is a wasteful number, since it uses less digits than its factorization.

231661465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55657 (or 55650 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 231661465 is about 15220.4291989418. The cubic root of 231661465 is about 614.1643441354.

The spelling of 231661465 in words is "two hundred thirty-one million, six hundred sixty-one thousand, four hundred sixty-five".