31030985 has 4 divisors (see below), whose sum is σ = 37237188. Its totient is φ = 24824784.

The previous prime is 31030981. The next prime is 31031003. The reversal of 31030985 is 58903013.

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 14417209 + 16613776 = 3797^2 + 4076^2 .

It is a cyclic number.

It is not a de Polignac number, because 31030985 - 2² = 31030981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31030981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3103094 + ... + 3103103.

It is an arithmetic number, because the mean of its divisors is an integer number (9309297).

Almost surely, 2^31030985 is an apocalyptic number.

It is an amenable number.

31030985 is a deficient number, since it is larger than the sum of its proper divisors (6206203).

31030985 is an equidigital number, since it uses as much as digits as its factorization.

31030985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6206202.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 31030985 is about 5570.5462030217. The cubic root of 31030985 is about 314.2426924090.

Adding to 31030985 its reverse (58903013), we get a palindrome (89933998).

The spelling of 31030985 in words is "thirty-one million, thirty thousand, nine hundred eighty-five".