31961616187 has 16 divisors (see below), whose sum is σ = 33437664000. Its totient is φ = 30514936320.

The previous prime is 31961616119. The next prime is 31961616209. The reversal of 31961616187 is 78161616913.

It is a cyclic number.

It is not a de Polignac number, because 31961616187 - 2³¹ = 29814132539 is a prime.

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 31961616187.

It is not an unprimeable number, because it can be changed into a prime (31961616107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1248189 + ... + 1273537.

It is an arithmetic number, because the mean of its divisors is an integer number (2089854000).

Almost surely, 2^31961616187 is an apocalyptic number.

31961616187 is a deficient number, since it is larger than the sum of its proper divisors (1476047813).

31961616187 is a wasteful number, since it uses less digits than its factorization.

31961616187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25926.

The product of its digits is 326592, while the sum is 49.

The spelling of 31961616187 in words is "thirty-one billion, nine hundred sixty-one million, six hundred sixteen thousand, one hundred eighty-seven".