31011109987 has 32 divisors (see below), whose sum is σ = 37025856000. Its totient is φ = 25601184000.

The previous prime is 31011109981. The next prime is 31011110021. The reversal of 31011109987 is 78990111013.

It is a cyclic number.

It is not a de Polignac number, because 31011109987 - 2⁷ = 31011109859 is a prime.

It is a super-2 number, since 2×31011109987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (31011109981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5063287 + ... + 5069407.

It is an arithmetic number, because the mean of its divisors is an integer number (1157058000).

Almost surely, 2^31011109987 is an apocalyptic number.

31011109987 is a deficient number, since it is larger than the sum of its proper divisors (6014746013).

31011109987 is a wasteful number, since it uses less digits than its factorization.

31011109987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6715.

The product of its (nonzero) digits is 13608, while the sum is 40.

The spelling of 31011109987 in words is "thirty-one billion, eleven million, one hundred nine thousand, nine hundred eighty-seven".