231634301561 has 12 divisors (see below), whose sum is σ = 259472014380. Its totient is φ = 206443298880.

The previous prime is 231634301531. The next prime is 231634301581. The reversal of 231634301561 is 165103436132.

It can be written as a sum of positive squares in 6 ways, for example, as 26787541561 + 204846760000 = 163669^2 + 452600^2 .

It is not a de Polignac number, because 231634301561 - 2⁶ = 231634301497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231634301531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23626430 + ... + 23636231.

It is an arithmetic number, because the mean of its divisors is an integer number (21622667865).

Almost surely, 2^231634301561 is an apocalyptic number.

It is an amenable number.

231634301561 is a deficient number, since it is larger than the sum of its proper divisors (27837712819).

231634301561 is a wasteful number, since it uses less digits than its factorization.

231634301561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47262716 (or 47262703 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 231634301561 its reverse (165103436132), we get a palindrome (396737737693).

The spelling of 231634301561 in words is "two hundred thirty-one billion, six hundred thirty-four million, three hundred one thousand, five hundred sixty-one".