231545502241505 has 8 divisors (see below), whose sum is σ = 294198991083432. Its totient is φ = 174340142864128.

The previous prime is 231545502241433. The next prime is 231545502241517. The reversal of 231545502241505 is 505142205545132.

It can be written as a sum of positive squares in 4 ways, for example, as 89008431687184 + 142537070554321 = 9434428^2 + 11938889^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231545502241505 is a prime.

It is a super-2 number, since 2×231545502241505² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1362032366042 + ... + 1362032366211.

It is an arithmetic number, because the mean of its divisors is an integer number (36774873885429).

Almost surely, 2^{231545502241505} is an apocalyptic number.

It is an amenable number.

231545502241505 is a deficient number, since it is larger than the sum of its proper divisors (62653488841927).

231545502241505 is a wasteful number, since it uses less digits than its factorization.

231545502241505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2724064732275.

The product of its (nonzero) digits is 1200000, while the sum is 44.

Adding to 231545502241505 its reverse (505142205545132), we get a palindrome (736687707786637).

The spelling of 231545502241505 in words is "two hundred thirty-one trillion, five hundred forty-five billion, five hundred two million, two hundred forty-one thousand, five hundred five".