231620456 has 8 divisors (see below), whose sum is σ = 434288370. Its totient is φ = 115810224.

The previous prime is 231620429. The next prime is 231620471. The reversal of 231620456 is 654026132.

It can be written as a sum of positive squares in only one way, i.e., 230007556 + 1612900 = 15166^2 + 1270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 14476271 + ... + 14476286.

Almost surely, 2^231620456 is an apocalyptic number.

It is an amenable number.

231620456 is a deficient number, since it is larger than the sum of its proper divisors (202667914).

231620456 is a wasteful number, since it uses less digits than its factorization.

231620456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28952563 (or 28952559 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 231620456 is about 15219.0819696853. The cubic root of 231620456 is about 614.1281019520.

Adding to 231620456 its reverse (654026132), we get a palindrome (885646588).

The spelling of 231620456 in words is "two hundred thirty-one million, six hundred twenty thousand, four hundred fifty-six".