31285105 has 8 divisors (see below), whose sum is σ = 38250792. Its totient is φ = 24555648.

The previous prime is 31285087. The next prime is 31285109. The reversal of 31285105 is 50158213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11916304 + 19368801 = 3452^2 + 4401^2 .

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 31285105 - 2⁵ = 31285073 is a prime.

It is a super-2 number, since 2×31285105² = 1957515589722050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31285105.

It is not an unprimeable number, because it can be changed into a prime (31285109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58764 + ... + 59293.

It is an arithmetic number, because the mean of its divisors is an integer number (4781349).

Almost surely, 2^31285105 is an apocalyptic number.

It is an amenable number.

31285105 is a deficient number, since it is larger than the sum of its proper divisors (6965687).

31285105 is a wasteful number, since it uses less digits than its factorization.

31285105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118115.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 31285105 is about 5593.3089490927. The cubic root of 31285105 is about 315.0981637454.

The spelling of 31285105 in words is "thirty-one million, two hundred eighty-five thousand, one hundred five".