31089005 has 32 divisors (see below), whose sum is σ = 41243904. Its totient is φ = 22404096.

The previous prime is 31088989. The next prime is 31089007. The reversal of 31089005 is 50098013.

It is not a de Polignac number, because 31089005 - 2⁴ = 31088989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31089007) 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, 301784 + ... + 301886.

It is an arithmetic number, because the mean of its divisors is an integer number (1288872).

Almost surely, 2^31089005 is an apocalyptic number.

It is an amenable number.

31089005 is a deficient number, since it is larger than the sum of its proper divisors (10154899).

31089005 is a wasteful number, since it uses less digits than its factorization.

31089005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 31089005 is about 5575.7515188538. The cubic root of 31089005 is about 314.4384216081.

The spelling of 31089005 in words is "thirty-one million, eighty-nine thousand, five".