2002123451 has 4 divisors (see below), whose sum is σ = 2003465952. Its totient is φ = 2000780952.

The previous prime is 2002123399. The next prime is 2002123511. The reversal of 2002123451 is 1543212002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002123451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002123351) 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, 669011 + ... + 671996.

It is an arithmetic number, because the mean of its divisors is an integer number (500866488).

Almost surely, 2^2002123451 is an apocalyptic number.

2002123451 is a deficient number, since it is larger than the sum of its proper divisors (1342501).

2002123451 is a wasteful number, since it uses less digits than its factorization.

2002123451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342500.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2002123451 is about 44745.0941556725. The cubic root of 2002123451 is about 1260.3667889501.

Adding to 2002123451 its reverse (1543212002), we get a palindrome (3545335453).

The spelling of 2002123451 in words is "two billion, two million, one hundred twenty-three thousand, four hundred fifty-one".