231513512641 has 4 divisors (see below), whose sum is σ = 232806884400. Its totient is φ = 230220140884.

The previous prime is 231513512639. The next prime is 231513512683. The reversal of 231513512641 is 146215315132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231513512641 - 2¹ = 231513512639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231513512597 and 231513512606.

It is not an unprimeable number, because it can be changed into a prime (231513512941) 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, 646685611 + ... + 646685968.

It is an arithmetic number, because the mean of its divisors is an integer number (58201721100).

Almost surely, 2^231513512641 is an apocalyptic number.

It is an amenable number.

231513512641 is a deficient number, since it is larger than the sum of its proper divisors (1293371759).

231513512641 is a wasteful number, since it uses less digits than its factorization.

231513512641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293371758.

The product of its digits is 21600, while the sum is 34.

Adding to 231513512641 its reverse (146215315132), we get a palindrome (377728827773).

The spelling of 231513512641 in words is "two hundred thirty-one billion, five hundred thirteen million, five hundred twelve thousand, six hundred forty-one".