31128085 has 8 divisors (see below), whose sum is σ = 38977920. Its totient is φ = 23819664.

The previous prime is 31128079. The next prime is 31128091. The reversal of 31128085 is 58082113.

It is an interprime number because it is at equal distance from previous prime (31128079) and next prime (31128091).

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 31128085 - 2¹¹ = 31126037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135225 + ... + 135454.

It is an arithmetic number, because the mean of its divisors is an integer number (4872240).

Almost surely, 2^31128085 is an apocalyptic number.

It is an amenable number.

31128085 is a deficient number, since it is larger than the sum of its proper divisors (7849835).

31128085 is a wasteful number, since it uses less digits than its factorization.

31128085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270707.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 31128085 is about 5579.2548785658. The cubic root of 31128085 is about 314.5701199173.

The spelling of 31128085 in words is "thirty-one million, one hundred twenty-eight thousand, eighty-five".