2131998901 has 2 divisors, whose sum is σ = 2131998902. Its totient is φ = 2131998900.

The previous prime is 2131998899. The next prime is 2131998937. The reversal of 2131998901 is 1098991312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1774599876 + 357399025 = 42126^2 + 18905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131998901 - 2¹ = 2131998899 is a prime.

Together with 2131998899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131998601) 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, 1065999450 + 1065999451.

It is an arithmetic number, because the mean of its divisors is an integer number (1065999451).

Almost surely, 2^2131998901 is an apocalyptic number.

It is an amenable number.

2131998901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131998901 is an equidigital number, since it uses as much as digits as its factorization.

2131998901 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2131998901 is about 46173.5736217157. The cubic root of 2131998901 is about 1287.0507109368.

The spelling of 2131998901 in words is "two billion, one hundred thirty-one million, nine hundred ninety-eight thousand, nine hundred one".