31240201 has 4 divisors (see below), whose sum is σ = 31320900. Its totient is φ = 31159504.

The previous prime is 31240171. The next prime is 31240207. The reversal of 31240201 is 10204213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10204213 = 1753 ⋅5821.

It can be written as a sum of positive squares in 2 ways, for example, as 17438976 + 13801225 = 4176^2 + 3715^2 .

It is a cyclic number.

It is not a de Polignac number, because 31240201 - 2¹⁷ = 31109129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31240207) 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, 39766 + ... + 40543.

It is an arithmetic number, because the mean of its divisors is an integer number (7830225).

Almost surely, 2^31240201 is an apocalyptic number.

It is an amenable number.

31240201 is a deficient number, since it is larger than the sum of its proper divisors (80699).

31240201 is an equidigital number, since it uses as much as digits as its factorization.

31240201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80698.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 31240201 is about 5589.2934258276. The cubic root of 31240201 is about 314.9473364550.

Adding to 31240201 its reverse (10204213), we get a palindrome (41444414).

The spelling of 31240201 in words is "thirty-one million, two hundred forty thousand, two hundred one".