2043400251 has 4 divisors (see below), whose sum is σ = 2724533672. Its totient is φ = 1362266832.

The previous prime is 2043400243. The next prime is 2043400253. The reversal of 2043400251 is 1520043402.

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

It is not a de Polignac number, because 2043400251 - 2³ = 2043400243 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (2043400253) 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, 340566706 + ... + 340566711.

It is an arithmetic number, because the mean of its divisors is an integer number (681133418).

Almost surely, 2^2043400251 is an apocalyptic number.

2043400251 is a deficient number, since it is larger than the sum of its proper divisors (681133421).

2043400251 is an equidigital number, since it uses as much as digits as its factorization.

2043400251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681133420.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 2043400251 is about 45203.9849017761. The cubic root of 2043400251 is about 1268.9693937020.

Adding to 2043400251 its reverse (1520043402), we get a palindrome (3563443653).

The spelling of 2043400251 in words is "two billion, forty-three million, four hundred thousand, two hundred fifty-one".