123211603 has 4 divisors (see below), whose sum is σ = 123244240. Its totient is φ = 123178968.

The previous prime is 123211589. The next prime is 123211609. The reversal of 123211603 is 306112321.

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 123211603 - 2¹³ = 123203411 is a prime.

It is a super-2 number, since 2×123211603² = 30362198227659218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123211609) 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, 9783 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (30811060).

Almost surely, 2^123211603 is an apocalyptic number.

123211603 is a deficient number, since it is larger than the sum of its proper divisors (32637).

123211603 is an equidigital number, since it uses as much as digits as its factorization.

123211603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32636.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 123211603 is about 11100.0722069723. The cubic root of 123211603 is about 497.6040074459.

Adding to 123211603 its reverse (306112321), we get a palindrome (429323924).

It can be divided in two parts, 12321 and 1603, that added together give a square (13924 = 118²).

The spelling of 123211603 in words is "one hundred twenty-three million, two hundred eleven thousand, six hundred three".