31391171085 has 8 divisors (see below), whose sum is σ = 50225873760. Its totient is φ = 16741957904.

The previous prime is 31391171083. The next prime is 31391171087. The reversal of 31391171085 is 58017119313.

It is an interprime number because it is at equal distance from previous prime (31391171083) and next prime (31391171087).

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 31391171085 - 2¹ = 31391171083 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31391171083) 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 7 ways as a sum of consecutive naturals, for example, 1046372355 + ... + 1046372384.

It is an arithmetic number, because the mean of its divisors is an integer number (6278234220).

Almost surely, 2^31391171085 is an apocalyptic number.

It is an amenable number.

31391171085 is a deficient number, since it is larger than the sum of its proper divisors (18834702675).

31391171085 is a wasteful number, since it uses less digits than its factorization.

31391171085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092744747.

The product of its (nonzero) digits is 22680, while the sum is 39.

The spelling of 31391171085 in words is "thirty-one billion, three hundred ninety-one million, one hundred seventy-one thousand, eighty-five".