31105145 has 8 divisors (see below), whose sum is σ = 37389120. Its totient is φ = 24842160.

The previous prime is 31105141. The next prime is 31105157. The reversal of 31105145 is 54150113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31105145 - 2² = 31105141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31105141) 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 7 ways as a sum of consecutive naturals, for example, 1775 + ... + 8084.

It is an arithmetic number, because the mean of its divisors is an integer number (4673640).

Almost surely, 2^31105145 is an apocalyptic number.

It is an amenable number.

31105145 is a deficient number, since it is larger than the sum of its proper divisors (6283975).

31105145 is an equidigital number, since it uses as much as digits as its factorization.

31105145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10495.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 31105145 is about 5577.1986695831. The cubic root of 31105145 is about 314.4928262455.

Adding to 31105145 its reverse (54150113), we get a palindrome (85255258).

The spelling of 31105145 in words is "thirty-one million, one hundred five thousand, one hundred forty-five".