2002155523 has 4 divisors (see below), whose sum is σ = 2002401648. Its totient is φ = 2001909400.

The previous prime is 2002155521. The next prime is 2002155587. The reversal of 2002155523 is 3255512002.

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 2002155523 - 2¹ = 2002155521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002155521) 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, 110428 + ... + 127273.

It is an arithmetic number, because the mean of its divisors is an integer number (500600412).

Almost surely, 2^2002155523 is an apocalyptic number.

2002155523 is a deficient number, since it is larger than the sum of its proper divisors (246125).

2002155523 is an equidigital number, since it uses as much as digits as its factorization.

2002155523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246124.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 2002155523 is about 44745.4525398950. The cubic root of 2002155523 is about 1260.3735188494.

Adding to 2002155523 its reverse (3255512002), we get a palindrome (5257667525).

The spelling of 2002155523 in words is "two billion, two million, one hundred fifty-five thousand, five hundred twenty-three".