2131201999 has 4 divisors (see below), whose sum is σ = 2136570664. Its totient is φ = 2125833336.

The previous prime is 2131201993. The next prime is 2131202033. The reversal of 2131201999 is 9991021312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2131201999 - 2⁷ = 2131201871 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131201993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2683737 + ... + 2684530.

It is an arithmetic number, because the mean of its divisors is an integer number (534142666).

Almost surely, 2^2131201999 is an apocalyptic number.

2131201999 is a deficient number, since it is larger than the sum of its proper divisors (5368665).

2131201999 is an equidigital number, since it uses as much as digits as its factorization.

2131201999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368664.

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

The square root of 2131201999 is about 46164.9433986440. The cubic root of 2131201999 is about 1286.8903323203.

The spelling of 2131201999 in words is "two billion, one hundred thirty-one million, two hundred one thousand, nine hundred ninety-nine".