201123103111031 has 2 divisors, whose sum is σ = 201123103111032. Its totient is φ = 201123103111030.

The previous prime is 201123103110991. The next prime is 201123103111037. The reversal of 201123103111031 is 130111301321102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201123103111031 - 2⁴² = 196725056599927 is a prime.

It is a super-2 number, since 2×201123103111031² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201123103110994 and 201123103111012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201123103111037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100561551555515 + 100561551555516.

It is an arithmetic number, because the mean of its divisors is an integer number (100561551555516).

Almost surely, 2^{201123103111031} is an apocalyptic number.

201123103111031 is a deficient number, since it is larger than the sum of its proper divisors (1).

201123103111031 is an equidigital number, since it uses as much as digits as its factorization.

201123103111031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 201123103111031 its reverse (130111301321102), we get a palindrome (331234404432133).

The spelling of 201123103111031 in words is "two hundred one trillion, one hundred twenty-three billion, one hundred three million, one hundred eleven thousand, thirty-one".