123201531 has 6 divisors (see below), whose sum is σ = 177957780. Its totient is φ = 82134348.

The previous prime is 123201473. The next prime is 123201553. The reversal of 123201531 is 135102321.

It is not a de Polignac number, because 123201531 - 2⁶ = 123201467 is a prime.

It is a super-2 number, since 2×123201531² = 30357234481487922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123201581) 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, 6844521 + ... + 6844538.

It is an arithmetic number, because the mean of its divisors is an integer number (29659630).

Almost surely, 2^123201531 is an apocalyptic number.

123201531 is a deficient number, since it is larger than the sum of its proper divisors (54756249).

123201531 is a wasteful number, since it uses less digits than its factorization.

123201531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13689065 (or 13689062 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 123201531 is about 11099.6185069578. The cubic root of 123201531 is about 497.5904481056.

Adding to 123201531 its reverse (135102321), we get a palindrome (258303852).

The spelling of 123201531 in words is "one hundred twenty-three million, two hundred one thousand, five hundred thirty-one".