31212085 has 8 divisors (see below), whose sum is σ = 39657816. Its totient is φ = 23500800.

The previous prime is 31212061. The next prime is 31212113. The reversal of 31212085 is 58021213.

It can be written as a sum of positive squares in 4 ways, for example, as 1170724 + 30041361 = 1082^2 + 5481^2 .

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

It is not a de Polignac number, because 31212085 - 2¹¹ = 31210037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183516 + ... + 183685.

It is an arithmetic number, because the mean of its divisors is an integer number (4957227).

Almost surely, 2^31212085 is an apocalyptic number.

It is an amenable number.

31212085 is a deficient number, since it is larger than the sum of its proper divisors (8445731).

31212085 is a wasteful number, since it uses less digits than its factorization.

31212085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367223.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 31212085 is about 5586.7776938053. Note that the first 3 decimals coincide. The cubic root of 31212085 is about 314.8528245029.

Adding to 31212085 its reverse (58021213), we get a palindrome (89233298).

It can be divided in two parts, 3121208 and 5, that added together give a palindrome (3121213).

The spelling of 31212085 in words is "thirty-one million, two hundred twelve thousand, eighty-five".