31223201 has 8 divisors (see below), whose sum is σ = 31898664. Its totient is φ = 30551040.

The previous prime is 31223191. The next prime is 31223209. The reversal of 31223201 is 10232213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19140625 + 12082576 = 4375^2 + 3476^2 .

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 31223201 - 2¹⁸ = 30961057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223209) 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, 30071 + ... + 31091.

It is an arithmetic number, because the mean of its divisors is an integer number (3987333).

Almost surely, 2^31223201 is an apocalyptic number.

It is an amenable number.

31223201 is a deficient number, since it is larger than the sum of its proper divisors (675463).

31223201 is a wasteful number, since it uses less digits than its factorization.

31223201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31223201 is about 5587.7724542075. The cubic root of 31223201 is about 314.8901977254.

Adding to 31223201 its reverse (10232213), we get a palindrome (41455414).

The spelling of 31223201 in words is "thirty-one million, two hundred twenty-three thousand, two hundred one".