31485511687 has 6 divisors (see below), whose sum is σ = 36626003448. Its totient is φ = 26987581404.

The previous prime is 31485511663. The next prime is 31485511703. The reversal of 31485511687 is 78611558413.

It is a happy number.

It is not a de Polignac number, because 31485511687 - 2⁷ = 31485511559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 642561463 = 31485511687 / (3 + 1 + 4 + 8 + 5 + 5 + 1 + 1 + 6 + 8 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31485511687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31485511087) 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 5 ways as a sum of consecutive naturals, for example, 321280683 + ... + 321280780.

It is an arithmetic number, because the mean of its divisors is an integer number (6104333908).

Almost surely, 2^31485511687 is an apocalyptic number.

31485511687 is a deficient number, since it is larger than the sum of its proper divisors (5140491761).

31485511687 is an equidigital number, since it uses as much as digits as its factorization.

31485511687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642561477 (or 642561470 counting only the distinct ones).

The product of its digits is 806400, while the sum is 49.

The spelling of 31485511687 in words is "thirty-one billion, four hundred eighty-five million, five hundred eleven thousand, six hundred eighty-seven".