31109201 has 8 divisors (see below), whose sum is σ = 33743304. Its totient is φ = 28564480.

The previous prime is 31109189. The next prime is 31109203. The reversal of 31109201 is 10290113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6507601 + 24601600 = 2551^2 + 4960^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31109201 - 2²² = 26914897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31109201.

It is not an unprimeable number, because it can be changed into a prime (31109203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21620 + ... + 23013.

It is an arithmetic number, because the mean of its divisors is an integer number (4217913).

Almost surely, 2^31109201 is an apocalyptic number.

It is an amenable number.

31109201 is a deficient number, since it is larger than the sum of its proper divisors (2634103).

31109201 is a wasteful number, since it uses less digits than its factorization.

31109201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44691.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 31109201 is about 5577.5622811404. The cubic root of 31109201 is about 314.5064952324.

Adding to 31109201 its reverse (10290113), we get a palindrome (41399314).

The spelling of 31109201 in words is "thirty-one million, one hundred nine thousand, two hundred one".