31887643068851 has 8 divisors (see below), whose sum is σ = 31915182070464. Its totient is φ = 31860106724160.

The previous prime is 31887643068829. The next prime is 31887643068863. The reversal of 31887643068851 is 15886034678813.

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

It is a cyclic number.

It is not a de Polignac number, because 31887643068851 - 2¹⁰ = 31887643067827 is a prime.

It is a super-2 number, since 2×31887643068851² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31887643068821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23736095 + ... + 25043511.

It is an arithmetic number, because the mean of its divisors is an integer number (3989397758808).

Almost surely, 2^{31887643068851} is an apocalyptic number.

31887643068851 is a deficient number, since it is larger than the sum of its proper divisors (27539001613).

31887643068851 is a wasteful number, since it uses less digits than its factorization.

31887643068851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328461.

The product of its (nonzero) digits is 185794560, while the sum is 68.

The spelling of 31887643068851 in words is "thirty-one trillion, eight hundred eighty-seven billion, six hundred forty-three million, sixty-eight thousand, eight hundred fifty-one".