31187143634 has 8 divisors (see below), whose sum is σ = 48393843660. Its totient is φ = 15055862416.

The previous prime is 31187143633. The next prime is 31187143649. The reversal of 31187143634 is 43634178113.

It can be written as a sum of positive squares in 2 ways, for example, as 28595824609 + 2591319025 = 169103^2 + 50905^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31187143591 and 31187143600.

It is not an unprimeable number, because it can be changed into a prime (31187143633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 268854629 + ... + 268854744.

Almost surely, 2^31187143634 is an apocalyptic number.

31187143634 is a deficient number, since it is larger than the sum of its proper divisors (17206700026).

31187143634 is a wasteful number, since it uses less digits than its factorization.

31187143634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537709404.

The product of its digits is 145152, while the sum is 41.

The spelling of 31187143634 in words is "thirty-one billion, one hundred eighty-seven million, one hundred forty-three thousand, six hundred thirty-four".