31381105 has 16 divisors (see below), whose sum is σ = 43167744. Its totient is φ = 21453120.

The previous prime is 31381087. The next prime is 31381121. The reversal of 31381105 is 50118313.

It is not a de Polignac number, because 31381105 - 2⁵ = 31381073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12235 + ... + 14575.

It is an arithmetic number, because the mean of its divisors is an integer number (2697984).

Almost surely, 2^31381105 is an apocalyptic number.

31381105 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31381105 is a deficient number, since it is larger than the sum of its proper divisors (11786639).

31381105 is a wasteful number, since it uses less digits than its factorization.

31381105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 31381105 is about 5601.8840580648. The cubic root of 31381105 is about 315.4201331055.

Adding to 31381105 its reverse (50118313), we get a palindrome (81499418).

It can be divided in two parts, 313 and 81105, that added together give a palindrome (81418).

The spelling of 31381105 in words is "thirty-one million, three hundred eighty-one thousand, one hundred five".