31121688370 has 16 divisors (see below), whose sum is σ = 57385357848. Its totient is φ = 12145048960.

The previous prime is 31121688347. The next prime is 31121688373. The reversal of 31121688370 is 7388612113.

It can be written as a sum of positive squares in 4 ways, for example, as 16980435481 + 14141252889 = 130309^2 + 118917^2 .

It is not an unprimeable number, because it can be changed into a prime (31121688373) 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 7 ways as a sum of consecutive naturals, for example, 37952869 + ... + 37953688.

Almost surely, 2^31121688370 is an apocalyptic number.

31121688370 is a deficient number, since it is larger than the sum of its proper divisors (26263669478).

31121688370 is a wasteful number, since it uses less digits than its factorization.

31121688370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75906605.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 31121688370 in words is "thirty-one billion, one hundred twenty-one million, six hundred eighty-eight thousand, three hundred seventy".