31408241 has 8 divisors (see below), whose sum is σ = 31881960. Its totient is φ = 30938112.

The previous prime is 31408219. The next prime is 31408253. The reversal of 31408241 is 14280413.

It can be written as a sum of positive squares in 4 ways, for example, as 9120400 + 22287841 = 3020^2 + 4721^2 .

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 31408241 - 2¹⁸ = 31146097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31408211) 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 7 ways as a sum of consecutive naturals, for example, 20291 + ... + 21783.

It is an arithmetic number, because the mean of its divisors is an integer number (3985245).

Almost surely, 2^31408241 is an apocalyptic number.

It is an amenable number.

31408241 is a deficient number, since it is larger than the sum of its proper divisors (473719).

31408241 is a wasteful number, since it uses less digits than its factorization.

31408241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 31408241 is about 5604.3055769649. The cubic root of 31408241 is about 315.5110240496.

Adding to 31408241 its reverse (14280413), we get a palindrome (45688654).

The spelling of 31408241 in words is "thirty-one million, four hundred eight thousand, two hundred forty-one".