31042705 has 4 divisors (see below), whose sum is σ = 37251252. Its totient is φ = 24834160.

The previous prime is 31042681. The next prime is 31042721. The reversal of 31042705 is 50724013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19509889 + 11532816 = 4417^2 + 3396^2 .

It is not a de Polignac number, because 31042705 - 2¹⁷ = 30911633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3104266 + ... + 3104275.

It is an arithmetic number, because the mean of its divisors is an integer number (9312813).

Almost surely, 2^31042705 is an apocalyptic number.

It is an amenable number.

31042705 is a deficient number, since it is larger than the sum of its proper divisors (6208547).

31042705 is an equidigital number, since it uses as much as digits as its factorization.

31042705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6208546.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 31042705 is about 5571.5980651874. The cubic root of 31042705 is about 314.2822492239.

Adding to 31042705 its reverse (50724013), we get a palindrome (81766718).

The spelling of 31042705 in words is "thirty-one million, forty-two thousand, seven hundred five".