123505431 has 24 divisors (see below), whose sum is σ = 192037104. Its totient is φ = 70398720.

The previous prime is 123505427. The next prime is 123505441. The reversal of 123505431 is 134505321.

It is not a de Polignac number, because 123505431 - 2² = 123505427 is a prime.

It is a super-2 number, since 2×123505431² = 30507182972991522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123505441) 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, 78751 + ... + 80303.

It is an arithmetic number, because the mean of its divisors is an integer number (8001546).

Almost surely, 2^123505431 is an apocalyptic number.

123505431 is a deficient number, since it is larger than the sum of its proper divisors (68531673).

123505431 is a wasteful number, since it uses less digits than its factorization.

123505431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 123505431 is about 11113.2997350022. The cubic root of 123505431 is about 497.9992459788. Note that the first 3 decimals are identical.

The spelling of 123505431 in words is "one hundred twenty-three million, five hundred five thousand, four hundred thirty-one".