31388206450 has 12 divisors (see below), whose sum is σ = 58382064090. Its totient is φ = 12555282560.

The previous prime is 31388206439. The next prime is 31388206471. The reversal of 31388206450 is 5460288313.

It can be written as a sum of positive squares in 3 ways, for example, as 19007861161 + 12380345289 = 137869^2 + 111267^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 313882015 + ... + 313882114.

Almost surely, 2^31388206450 is an apocalyptic number.

31388206450 is a deficient number, since it is larger than the sum of its proper divisors (26993857640).

31388206450 is a wasteful number, since it uses less digits than its factorization.

31388206450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627764141 (or 627764136 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 31388206450 in words is "thirty-one billion, three hundred eighty-eight million, two hundred six thousand, four hundred fifty".