31305413 has 8 divisors (see below), whose sum is σ = 32513400. Its totient is φ = 30106048.

The previous prime is 31305401. The next prime is 31305451. The reversal of 31305413 is 31450313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3247204 + 28058209 = 1802^2 + 5297^2 .

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 31305413 - 2⁴ = 31305397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31305493) 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, 5795 + ... + 9807.

It is an arithmetic number, because the mean of its divisors is an integer number (4064175).

Almost surely, 2^31305413 is an apocalyptic number.

It is an amenable number.

31305413 is a deficient number, since it is larger than the sum of its proper divisors (1207987).

31305413 is a wasteful number, since it uses less digits than its factorization.

31305413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4311.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 31305413 is about 5595.1240379459. The cubic root of 31305413 is about 315.1663285523.

Adding to 31305413 its reverse (31450313), we get a palindrome (62755726).

The spelling of 31305413 in words is "thirty-one million, three hundred five thousand, four hundred thirteen".