231211601 has 2 divisors, whose sum is σ = 231211602. Its totient is φ = 231211600.

The previous prime is 231211583. The next prime is 231211633. The reversal of 231211601 is 106112132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143976001 + 87235600 = 11999^2 + 9340^2 .

It is a cyclic number.

It is not a de Polignac number, because 231211601 - 2¹⁸ = 230949457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231211601.

It is not a weakly prime, because it can be changed into another prime (231213601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115605800 + 115605801.

It is an arithmetic number, because the mean of its divisors is an integer number (115605801).

Almost surely, 2^231211601 is an apocalyptic number.

It is an amenable number.

231211601 is a deficient number, since it is larger than the sum of its proper divisors (1).

231211601 is an equidigital number, since it uses as much as digits as its factorization.

231211601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 231211601 is about 15205.6437219869. The cubic root of 231211601 is about 613.7665374124.

Adding to 231211601 its reverse (106112132), we get a palindrome (337323733).

The spelling of 231211601 in words is "two hundred thirty-one million, two hundred eleven thousand, six hundred one".