123011431 has 4 divisors (see below), whose sum is σ = 123034032. Its totient is φ = 122988832.

The previous prime is 123011411. The next prime is 123011437. The reversal of 123011431 is 134110321.

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 123011431 - 2¹⁹ = 122487143 is a prime.

It is a super-2 number, since 2×123011431² = 30263624313335522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123011437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2406 + ... + 15868.

It is an arithmetic number, because the mean of its divisors is an integer number (30758508).

Almost surely, 2^123011431 is an apocalyptic number.

123011431 is a deficient number, since it is larger than the sum of its proper divisors (22601).

123011431 is an equidigital number, since it uses as much as digits as its factorization.

123011431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22600.

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

The square root of 123011431 is about 11091.0518437162. The cubic root of 123011431 is about 497.3343889561.

Adding to 123011431 its reverse (134110321), we get a palindrome (257121752).

The spelling of 123011431 in words is "one hundred twenty-three million, eleven thousand, four hundred thirty-one".