2103129991 has 2 divisors, whose sum is σ = 2103129992. Its totient is φ = 2103129990.

The previous prime is 2103129971. The next prime is 2103130049. The reversal of 2103129991 is 1999213012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2103129991 - 2²⁵ = 2069575559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2103129991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2103129971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051564995 + 1051564996.

It is an arithmetic number, because the mean of its divisors is an integer number (1051564996).

Almost surely, 2^2103129991 is an apocalyptic number.

2103129991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2103129991 is an equidigital number, since it uses as much as digits as its factorization.

2103129991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 2103129991 is about 45859.8952353797. The cubic root of 2103129991 is about 1281.2150715808.

The spelling of 2103129991 in words is "two billion, one hundred three million, one hundred twenty-nine thousand, nine hundred ninety-one".