31089993 has 16 divisors (see below), whose sum is σ = 46682112. Its totient is φ = 18234000.

The previous prime is 31089941. The next prime is 31090021. The reversal of 31089993 is 39998013.

It is a happy number.

It is not a de Polignac number, because 31089993 - 2¹² = 31085897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31085993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14173 + ... + 16218.

It is an arithmetic number, because the mean of its divisors is an integer number (2917632).

Almost surely, 2^31089993 is an apocalyptic number.

31089993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31089993 is a deficient number, since it is larger than the sum of its proper divisors (15592119).

31089993 is a wasteful number, since it uses less digits than its factorization.

31089993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30436.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 31089993 is about 5575.8401160722. The cubic root of 31089993 is about 314.4417524949.

The spelling of 31089993 in words is "thirty-one million, eighty-nine thousand, nine hundred ninety-three".