31642213 has 4 divisors (see below), whose sum is σ = 31656780. Its totient is φ = 31627648.

The previous prime is 31642207. The next prime is 31642217. The reversal of 31642213 is 31224613.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15626209 + 16016004 = 3953^2 + 4002^2 .

It is a cyclic number.

It is not a de Polignac number, because 31642213 - 2¹³ = 31634021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31642217) 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 in 3 ways as a sum of consecutive naturals, for example, 3298 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (7914195).

Almost surely, 2^31642213 is an apocalyptic number.

It is an amenable number.

31642213 is a deficient number, since it is larger than the sum of its proper divisors (14567).

31642213 is a wasteful number, since it uses less digits than its factorization.

31642213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14566.

The product of its digits is 864, while the sum is 22.

The square root of 31642213 is about 5625.1411537845. The cubic root of 31642213 is about 316.2925407421.

Adding to 31642213 its reverse (31224613), we get a palindrome (62866826).

The spelling of 31642213 in words is "thirty-one million, six hundred forty-two thousand, two hundred thirteen".