31230681049 has 4 divisors (see below), whose sum is σ = 31819939236. Its totient is φ = 30641422864.

The previous prime is 31230681023. The next prime is 31230681067. The reversal of 31230681049 is 94018603213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94018603213 = 149 ⋅630997337.

It can be written as a sum of positive squares in 2 ways, for example, as 7964670025 + 23266011024 = 89245^2 + 152532^2 .

It is a cyclic number.

It is not a de Polignac number, because 31230681049 - 2⁵ = 31230681017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31230680999 and 31230681017.

It is not an unprimeable number, because it can be changed into a prime (31230681149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294629014 + ... + 294629119.

It is an arithmetic number, because the mean of its divisors is an integer number (7954984809).

Almost surely, 2^31230681049 is an apocalyptic number.

It is an amenable number.

31230681049 is a deficient number, since it is larger than the sum of its proper divisors (589258187).

31230681049 is an equidigital number, since it uses as much as digits as its factorization.

31230681049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589258186.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 31230681049 in words is "thirty-one billion, two hundred thirty million, six hundred eighty-one thousand, forty-nine".