31205201 has 6 divisors (see below), whose sum is σ = 32934402. Its totient is φ = 29562480.

The previous prime is 31205177. The next prime is 31205203. The reversal of 31205201 is 10250213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27300625 + 3904576 = 5225^2 + 1976^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31205201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31205203) 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 5 ways as a sum of consecutive naturals, for example, 42860 + ... + 43581.

It is an arithmetic number, because the mean of its divisors is an integer number (5489067).

Almost surely, 2^31205201 is an apocalyptic number.

It is an amenable number.

31205201 is a deficient number, since it is larger than the sum of its proper divisors (1729201).

31205201 is an equidigital number, since it uses as much as digits as its factorization.

31205201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86479 (or 86460 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 31205201 is about 5586.1615622894. The cubic root of 31205201 is about 314.8296752835.

Adding to 31205201 its reverse (10250213), we get a palindrome (41455414).

The spelling of 31205201 in words is "thirty-one million, two hundred five thousand, two hundred one".