231649465 has 4 divisors (see below), whose sum is σ = 277979364. Its totient is φ = 185319568.

The previous prime is 231649423. The next prime is 231649469. The reversal of 231649465 is 564946132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144096016 + 87553449 = 12004^2 + 9357^2 .

It is a cyclic number.

It is not a de Polignac number, because 231649465 - 2⁷ = 231649337 is a prime.

It is a super-5 number, since 5×231649465⁵ (a number of 43 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231649469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23164942 + ... + 23164951.

It is an arithmetic number, because the mean of its divisors is an integer number (69494841).

Almost surely, 2^231649465 is an apocalyptic number.

It is an amenable number.

231649465 is a deficient number, since it is larger than the sum of its proper divisors (46329899).

231649465 is an equidigital number, since it uses as much as digits as its factorization.

231649465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46329898.

The product of its digits is 155520, while the sum is 40.

The square root of 231649465 is about 15220.0349868192. The cubic root of 231649465 is about 614.1537394377.

The spelling of 231649465 in words is "two hundred thirty-one million, six hundred forty-nine thousand, four hundred sixty-five".