201123731 has 2 divisors, whose sum is σ = 201123732. Its totient is φ = 201123730.

The previous prime is 201123701. The next prime is 201123733. The reversal of 201123731 is 137321102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201123731 - 2⁶ = 201123667 is a prime.

It is a super-2 number, since 2×201123731² = 80901510342720722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 201123733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201123733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100561865 + 100561866.

It is an arithmetic number, because the mean of its divisors is an integer number (100561866).

Almost surely, 2^201123731 is an apocalyptic number.

201123731 is a deficient number, since it is larger than the sum of its proper divisors (1).

201123731 is an equidigital number, since it uses as much as digits as its factorization.

201123731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 201123731 is about 14181.8098633425. The cubic root of 201123731 is about 585.8967724998.

Adding to 201123731 its reverse (137321102), we get a palindrome (338444833).

The spelling of 201123731 in words is "two hundred one million, one hundred twenty-three thousand, seven hundred thirty-one".