31291323346 has 4 divisors (see below), whose sum is σ = 46936985022. Its totient is φ = 15645661672.

The previous prime is 31291323313. The next prime is 31291323347. The reversal of 31291323346 is 64332319213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64332319213 = 71 ⋅906089003.

It can be written as a sum of positive squares in only one way, i.e., 30454089121 + 837234225 = 174511^2 + 28935^2 .

It is not an unprimeable number, because it can be changed into a prime (31291323347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7822830835 + ... + 7822830838.

Almost surely, 2^31291323346 is an apocalyptic number.

31291323346 is a deficient number, since it is larger than the sum of its proper divisors (15645661676).

31291323346 is a wasteful number, since it uses less digits than its factorization.

31291323346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15645661675.

The product of its digits is 69984, while the sum is 37.

The spelling of 31291323346 in words is "thirty-one billion, two hundred ninety-one million, three hundred twenty-three thousand, three hundred forty-six".