31290106 has 4 divisors (see below), whose sum is σ = 46935162. Its totient is φ = 15645052.

The previous prime is 31290089. The next prime is 31290167. The reversal of 31290106 is 60109213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60109213 = 2551 ⋅23563.

It can be written as a sum of positive squares in only one way, i.e., 27468081 + 3822025 = 5241^2 + 1955^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7822525 + ... + 7822528.

Almost surely, 2^31290106 is an apocalyptic number.

31290106 is a deficient number, since it is larger than the sum of its proper divisors (15645056).

31290106 is a wasteful number, since it uses less digits than its factorization.

31290106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15645055.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31290106 is about 5593.7559832370. The cubic root of 31290106 is about 315.1149525864.

Adding to 31290106 its reverse (60109213), we get a palindrome (91399319).

The spelling of 31290106 in words is "thirty-one million, two hundred ninety thousand, one hundred six".