31213102 has 4 divisors (see below), whose sum is σ = 46819656. Its totient is φ = 15606550.

The previous prime is 31213099. The next prime is 31213109. The reversal of 31213102 is 20131213.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7803274 + ... + 7803277.

It is an arithmetic number, because the mean of its divisors is an integer number (11704914).

Almost surely, 2^31213102 is an apocalyptic number.

31213102 is a deficient number, since it is larger than the sum of its proper divisors (15606554).

31213102 is a wasteful number, since it uses less digits than its factorization.

31213102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15606553.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31213102 is about 5586.8687115414. The cubic root of 31213102 is about 314.8562441382.

Adding to 31213102 its reverse (20131213), we get a palindrome (51344315).

The spelling of 31213102 in words is "thirty-one million, two hundred thirteen thousand, one hundred two".