31212107 has 4 divisors (see below), whose sum is σ = 31229520. Its totient is φ = 31194696.

The previous prime is 31212061. The next prime is 31212113. The reversal of 31212107 is 70121213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70121213 = 647 ⋅108379.

It is a cyclic number.

It is not a de Polignac number, because 31212107 - 2⁶ = 31212043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212197) 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, 5663 + ... + 9720.

It is an arithmetic number, because the mean of its divisors is an integer number (7807380).

Almost surely, 2^31212107 is an apocalyptic number.

31212107 is a deficient number, since it is larger than the sum of its proper divisors (17413).

31212107 is a wasteful number, since it uses less digits than its factorization.

31212107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17412.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 31212107 is about 5586.7796627395. The cubic root of 31212107 is about 314.8528984781.

The spelling of 31212107 in words is "thirty-one million, two hundred twelve thousand, one hundred seven".