123001001 has 6 divisors (see below), whose sum is σ = 130662270. Its totient is φ = 115765376.

The previous prime is 123000989. The next prime is 123001031. The reversal of 123001001 is 100100321.

It can be written as a sum of positive squares in 3 ways, for example, as 58920976 + 64080025 = 7676^2 + 8005^2 .

It is not a de Polignac number, because 123001001 - 2¹⁸ = 122738857 is a prime.

It is a Duffinian number.

123001001 is a modest number, since divided by 1001 gives 123 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 123001001.

It is not an unprimeable number, because it can be changed into a prime (123001031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212516 + ... + 213093.

It is an arithmetic number, because the mean of its divisors is an integer number (21777045).

Almost surely, 2^123001001 is an apocalyptic number.

It is an amenable number.

123001001 is a deficient number, since it is larger than the sum of its proper divisors (7661269).

123001001 is an equidigital number, since it uses as much as digits as its factorization.

123001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425643 (or 425626 counting only the distinct ones).

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

The square root of 123001001 is about 11090.5816348828. The cubic root of 123001001 is about 497.3203324189.

Adding to 123001001 its reverse (100100321), we get a palindrome (223101322).

The spelling of 123001001 in words is "one hundred twenty-three million, one thousand, one".