31242123 has 48 divisors (see below), whose sum is σ = 51891840. Its totient is φ = 17942400.

The previous prime is 31242109. The next prime is 31242139. The reversal of 31242123 is 32124213.

It is not a de Polignac number, because 31242123 - 2⁵ = 31242091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31242096 and 31242105.

It is not an unprimeable number, because it can be changed into a prime (31242103) 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, 174448 + ... + 174626.

It is an arithmetic number, because the mean of its divisors is an integer number (1081080).

Almost surely, 2^31242123 is an apocalyptic number.

31242123 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31242123 is a deficient number, since it is larger than the sum of its proper divisors (20649717).

31242123 is a wasteful number, since it uses less digits than its factorization.

31242123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 277 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 31242123 is about 5589.4653590482. The cubic root of 31242123 is about 314.9537951882.

Adding to 31242123 its reverse (32124213), we get a palindrome (63366336).

The spelling of 31242123 in words is "thirty-one million, two hundred forty-two thousand, one hundred twenty-three".