123131142 has 12 divisors (see below), whose sum is σ = 266784180. Its totient is φ = 41043708.

The previous prime is 123131131. The next prime is 123131143. The reversal of 123131142 is 241131321.

It is a super-2 number, since 2×123131142² = 30322556260448328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 6840619 = 123131142 / (1 + 2 + 3 + 1 + 3 + 1 + 1 + 4 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131143) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3420292 + ... + 3420327.

It is an arithmetic number, because the mean of its divisors is an integer number (22232015).

Almost surely, 2^123131142 is an apocalyptic number.

123131142 is an abundant number, since it is smaller than the sum of its proper divisors (143653038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123131142 is a wasteful number, since it uses less digits than its factorization.

123131142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6840627 (or 6840624 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 123131142 is about 11096.4472692840. The cubic root of 123131142 is about 497.4956669067.

Adding to 123131142 its reverse (241131321), we get a palindrome (364262463).

The spelling of 123131142 in words is "one hundred twenty-three million, one hundred thirty-one thousand, one hundred forty-two".