31347145 has 8 divisors (see below), whose sum is σ = 37646856. Its totient is φ = 25057536.

The previous prime is 31347143. The next prime is 31347161. The reversal of 31347145 is 54174313.

It can be written as a sum of positive squares in 4 ways, for example, as 10517049 + 20830096 = 3243^2 + 4564^2 .

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 31347145 - 2¹ = 31347143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31347143) 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, 9649 + ... + 12481.

It is an arithmetic number, because the mean of its divisors is an integer number (4705857).

Almost surely, 2^31347145 is an apocalyptic number.

It is an amenable number.

31347145 is a deficient number, since it is larger than the sum of its proper divisors (6299711).

31347145 is a wasteful number, since it uses less digits than its factorization.

31347145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051.

The product of its digits is 5040, while the sum is 28.

The square root of 31347145 is about 5598.8521144963. The cubic root of 31347145 is about 315.3063115980.

The spelling of 31347145 in words is "thirty-one million, three hundred forty-seven thousand, one hundred forty-five".