1000123001 has 4 divisors (see below), whose sum is σ = 1002443904. Its totient is φ = 997802100.

The previous prime is 1000122979. The next prime is 1000123031. The reversal of 1000123001 is 1003210001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1003210001 = 17 ⋅59012353.

It is a cyclic number.

It is not a de Polignac number, because 1000123001 - 2¹⁸ = 999860857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000123001.

It is not an unprimeable number, because it can be changed into a prime (1000123031) 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, 1159805 + ... + 1160666.

It is an arithmetic number, because the mean of its divisors is an integer number (250610976).

Almost surely, 2^1000123001 is an apocalyptic number.

It is an amenable number.

1000123001 is a deficient number, since it is larger than the sum of its proper divisors (2320903).

1000123001 is an equidigital number, since it uses as much as digits as its factorization.

1000123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320902.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1000123001 is about 31624.7213584563. The cubic root of 1000123001 is about 1000.0409986524.

Adding to 1000123001 its reverse (1003210001), we get a palindrome (2003333002).

The spelling of 1000123001 in words is "one billion, one hundred twenty-three thousand, one".