2131993 has 4 divisors (see below), whose sum is σ = 2205540. Its totient is φ = 2058448.

The previous prime is 2131991. The next prime is 2132003. The reversal of 2131993 is 3991312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1630729 + 501264 = 1277^2 + 708^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131993 - 2¹ = 2131991 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131991) 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, 36730 + ... + 36787.

It is an arithmetic number, because the mean of its divisors is an integer number (551385).

2^2131993 is an apocalyptic number.

It is an amenable number.

2131993 is a deficient number, since it is larger than the sum of its proper divisors (73547).

2131993 is an equidigital number, since it uses as much as digits as its factorization.

2131993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73546.

The product of its digits is 1458, while the sum is 28.

The square root of 2131993 is about 1460.1345828382. The cubic root of 2131993 is about 128.7049523492.

It can be divided in two parts, 21319 and 93, that added together give a palindrome (21412).

The spelling of 2131993 in words is "two million, one hundred thirty-one thousand, nine hundred ninety-three".