2002423261 has 4 divisors (see below), whose sum is σ = 2005014492. Its totient is φ = 1999832032.

The previous prime is 2002423253. The next prime is 2002423277. The reversal of 2002423261 is 1623242002.

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 936727236 + 1065696025 = 30606^2 + 32645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002423261 - 2³ = 2002423253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002423201) 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, 1294456 + ... + 1296001.

It is an arithmetic number, because the mean of its divisors is an integer number (501253623).

Almost surely, 2^2002423261 is an apocalyptic number.

It is an amenable number.

2002423261 is a deficient number, since it is larger than the sum of its proper divisors (2591231).

2002423261 is an equidigital number, since it uses as much as digits as its factorization.

2002423261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591230.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 2002423261 is about 44748.4442299394. Note that the first 3 decimals coincide. The cubic root of 2002423261 is about 1260.4296974431.

Adding to 2002423261 its reverse (1623242002), we get a palindrome (3625665263).

The spelling of 2002423261 in words is "two billion, two million, four hundred twenty-three thousand, two hundred sixty-one".