1002123231 has 4 divisors (see below), whose sum is σ = 1336164312. Its totient is φ = 668082152.

The previous prime is 1002123223. The next prime is 1002123233. The reversal of 1002123231 is 1323212001.

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 1002123231 - 2³ = 1002123223 is a prime.

It is a super-2 number, since 2×1002123231² = 2008501940219758722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1002123231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002123233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167020536 + ... + 167020541.

It is an arithmetic number, because the mean of its divisors is an integer number (334041078).

Almost surely, 2^1002123231 is an apocalyptic number.

1002123231 is a deficient number, since it is larger than the sum of its proper divisors (334041081).

1002123231 is an equidigital number, since it uses as much as digits as its factorization.

1002123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334041080.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1002123231 is about 31656.3300305010. The cubic root of 1002123231 is about 1000.7072433556.

Adding to 1002123231 its reverse (1323212001), we get a palindrome (2325335232).

The spelling of 1002123231 in words is "one billion, two million, one hundred twenty-three thousand, two hundred thirty-one".