31105389 has 16 divisors (see below), whose sum is σ = 47721600. Its totient is φ = 17653440.

The previous prime is 31105351. The next prime is 31105391. The reversal of 31105389 is 98350113.

It is a happy number.

It is not a de Polignac number, because 31105389 - 2¹² = 31101293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31105309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1842 + ... + 8099.

It is an arithmetic number, because the mean of its divisors is an integer number (2982600).

Almost surely, 2^31105389 is an apocalyptic number.

It is an amenable number.

31105389 is a deficient number, since it is larger than the sum of its proper divisors (16616211).

31105389 is a wasteful number, since it uses less digits than its factorization.

31105389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 31105389 is about 5577.2205443213. The cubic root of 31105389 is about 314.4936485751.

The spelling of 31105389 in words is "thirty-one million, one hundred five thousand, three hundred eighty-nine".