123431011 has 24 divisors (see below), whose sum is σ = 145650960. Its totient is φ = 104195520.

The previous prime is 123431003. The next prime is 123431029. The reversal of 123431011 is 110134321.

It is not a de Polignac number, because 123431011 - 2³ = 123431003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123431081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121341 + ... + 122353.

It is an arithmetic number, because the mean of its divisors is an integer number (6068790).

Almost surely, 2^123431011 is an apocalyptic number.

123431011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123431011 is a deficient number, since it is larger than the sum of its proper divisors (22219949).

123431011 is a wasteful number, since it uses less digits than its factorization.

123431011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 123431011 is about 11109.9509899909. The cubic root of 123431011 is about 497.8992003101.

Adding to 123431011 its reverse (110134321), we get a palindrome (233565332).

It can be divided in two parts, 1234310 and 11, that added together give a palindrome (1234321).

The spelling of 123431011 in words is "one hundred twenty-three million, four hundred thirty-one thousand, eleven".