123131534 has 16 divisors (see below), whose sum is σ = 186938928. Its totient is φ = 60821952.

The previous prime is 123131531. The next prime is 123131543. The reversal of 123131534 is 435131321.

It is a super-2 number, since 2×123131534² = 30322749330386312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118682 + ... + 119714.

It is an arithmetic number, because the mean of its divisors is an integer number (11683683).

Almost surely, 2^123131534 is an apocalyptic number.

123131534 is a deficient number, since it is larger than the sum of its proper divisors (63807394).

123131534 is a wasteful number, since it uses less digits than its factorization.

123131534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699.

The product of its digits is 1080, while the sum is 23.

The square root of 123131534 is about 11096.4649325810. The cubic root of 123131534 is about 497.4961948481.

Adding to 123131534 its reverse (435131321), we get a palindrome (558262855).

The spelling of 123131534 in words is "one hundred twenty-three million, one hundred thirty-one thousand, five hundred thirty-four".