201123232157 has 2 divisors, whose sum is σ = 201123232158. Its totient is φ = 201123232156.

The previous prime is 201123232129. The next prime is 201123232207. The reversal of 201123232157 is 751232321102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199139955001 + 1983277156 = 446251^2 + 44534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201123232157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201123292157) by changing a digit.

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 as a sum of consecutive naturals, namely, 100561616078 + 100561616079.

It is an arithmetic number, because the mean of its divisors is an integer number (100561616079).

Almost surely, 2^201123232157 is an apocalyptic number.

It is an amenable number.

201123232157 is a deficient number, since it is larger than the sum of its proper divisors (1).

201123232157 is an equidigital number, since it uses as much as digits as its factorization.

201123232157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 201123232157 its reverse (751232321102), we get a palindrome (952355553259).

The spelling of 201123232157 in words is "two hundred one billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred fifty-seven".