12139355531 has 4 divisors (see below), whose sum is σ = 12778269000. Its totient is φ = 11500442064.

The previous prime is 12139355513. The next prime is 12139355561. The reversal of 12139355531 is 13555393121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13555393121 = 29 ⋅467427349.

It is a cyclic number.

It is not a de Polignac number, because 12139355531 - 2³⁰ = 11065613707 is a prime.

It is a super-2 number, since 2×12139355531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12139355561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319456706 + ... + 319456743.

It is an arithmetic number, because the mean of its divisors is an integer number (3194567250).

Almost surely, 2^12139355531 is an apocalyptic number.

12139355531 is a deficient number, since it is larger than the sum of its proper divisors (638913469).

12139355531 is an equidigital number, since it uses as much as digits as its factorization.

12139355531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638913468.

The product of its digits is 60750, while the sum is 38.

The spelling of 12139355531 in words is "twelve billion, one hundred thirty-nine million, three hundred fifty-five thousand, five hundred thirty-one".