31111330985 has 32 divisors (see below), whose sum is σ = 43667527680. Its totient is φ = 20836827648.

The previous prime is 31111330963. The next prime is 31111331023. The reversal of 31111330985 is 58903311113.

It is a de Polignac number, because none of the positive numbers 2^k-31111330985 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 376061 + ... + 451269.

It is an arithmetic number, because the mean of its divisors is an integer number (1364610240).

Almost surely, 2^31111330985 is an apocalyptic number.

31111330985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31111330985 is a deficient number, since it is larger than the sum of its proper divisors (12556196695).

31111330985 is a wasteful number, since it uses less digits than its factorization.

31111330985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75497.

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 31111330985 in words is "thirty-one billion, one hundred eleven million, three hundred thirty thousand, nine hundred eighty-five".