31664201 has 4 divisors (see below), whose sum is σ = 32756100. Its totient is φ = 30572304.

The previous prime is 31664197. The next prime is 31664209. The reversal of 31664201 is 10246613.

It is a happy number.

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 5664400 + 25999801 = 2380^2 + 5099^2 .

It is a cyclic number.

It is not a de Polignac number, because 31664201 - 2² = 31664197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31664209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545906 + ... + 545963.

It is an arithmetic number, because the mean of its divisors is an integer number (8189025).

Almost surely, 2^31664201 is an apocalyptic number.

It is an amenable number.

31664201 is a deficient number, since it is larger than the sum of its proper divisors (1091899).

31664201 is a wasteful number, since it uses less digits than its factorization.

31664201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091898.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 31664201 is about 5627.0952542142. The cubic root of 31664201 is about 316.3657870950.

The spelling of 31664201 in words is "thirty-one million, six hundred sixty-four thousand, two hundred one".