123001011 has 48 divisors (see below), whose sum is σ = 212319744. Its totient is φ = 69704064.

The previous prime is 123000989. The next prime is 123001031. The reversal of 123001011 is 110100321.

It is not a de Polignac number, because 123001011 - 2⁵ = 123000979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 123000984 and 123001002.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 283851 + ... + 284283.

It is an arithmetic number, because the mean of its divisors is an integer number (4423328).

Almost surely, 2^123001011 is an apocalyptic number.

123001011 is a deficient number, since it is larger than the sum of its proper divisors (89318733).

123001011 is an equidigital number, since it uses as much as digits as its factorization.

123001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 123001011 is about 11090.5820857158. The cubic root of 123001011 is about 497.3203458963.

Adding to 123001011 its reverse (110100321), we get a palindrome (233101332).

The spelling of 123001011 in words is "one hundred twenty-three million, one thousand, eleven".