31216085 has 8 divisors (see below), whose sum is σ = 37656576. Its totient is φ = 24841360.

The previous prime is 31216061. The next prime is 31216103. The reversal of 31216085 is 58061213.

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

It is not a de Polignac number, because 31216085 - 2⁶ = 31216021 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, 15389 + ... + 17298.

It is an arithmetic number, because the mean of its divisors is an integer number (4707072).

Almost surely, 2^31216085 is an apocalyptic number.

It is an amenable number.

31216085 is a deficient number, since it is larger than the sum of its proper divisors (6440491).

31216085 is a wasteful number, since it uses less digits than its factorization.

31216085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32883.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 31216085 is about 5587.1356704487. The cubic root of 31216085 is about 314.8662739675.

Adding to 31216085 its reverse (58061213), we get a palindrome (89277298).

The spelling of 31216085 in words is "thirty-one million, two hundred sixteen thousand, eighty-five".