231210423505 has 32 divisors (see below), whose sum is σ = 285998211360. Its totient is φ = 179309168640.

The previous prime is 231210423497. The next prime is 231210423539. The reversal of 231210423505 is 505324012132.

It can be written as a sum of positive squares in 16 ways, for example, as 119114026641 + 112096396864 = 345129^2 + 334808^2 .

It is not a de Polignac number, because 231210423505 - 2³ = 231210423497 is a prime.

It is a super-2 number, since 2×231210423505² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83257677 + ... + 83260453.

It is an arithmetic number, because the mean of its divisors is an integer number (8937444105).

Almost surely, 2^231210423505 is an apocalyptic number.

It is an amenable number.

231210423505 is a deficient number, since it is larger than the sum of its proper divisors (54787787855).

231210423505 is a wasteful number, since it uses less digits than its factorization.

231210423505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4309.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 231210423505 its reverse (505324012132), we get a palindrome (736534435637).

The spelling of 231210423505 in words is "two hundred thirty-one billion, two hundred ten million, four hundred twenty-three thousand, five hundred five".