201031122129991 has 2 divisors, whose sum is σ = 201031122129992. Its totient is φ = 201031122129990.

The previous prime is 201031122129967. The next prime is 201031122130009. The reversal of 201031122129991 is 199921221130102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201031122129991 - 2⁴³ = 192235029107783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201031122129961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100515561064995 + 100515561064996.

It is an arithmetic number, because the mean of its divisors is an integer number (100515561064996).

Almost surely, 2^{201031122129991} is an apocalyptic number.

201031122129991 is a deficient number, since it is larger than the sum of its proper divisors (1).

201031122129991 is an equidigital number, since it uses as much as digits as its factorization.

201031122129991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The spelling of 201031122129991 in words is "two hundred one trillion, thirty-one billion, one hundred twenty-two million, one hundred twenty-nine thousand, nine hundred ninety-one".