31134209 has 4 divisors (see below), whose sum is σ = 31361604. Its totient is φ = 30906816.

The previous prime is 31134143. The next prime is 31134221. The reversal of 31134209 is 90243113.

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 19891600 + 11242609 = 4460^2 + 3353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31134209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31134239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113492 + ... + 113765.

It is an arithmetic number, because the mean of its divisors is an integer number (7840401).

Almost surely, 2^31134209 is an apocalyptic number.

It is an amenable number.

31134209 is a deficient number, since it is larger than the sum of its proper divisors (227395).

31134209 is a wasteful number, since it uses less digits than its factorization.

31134209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227394.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31134209 is about 5579.8036703812. The cubic root of 31134209 is about 314.5907476034.

The spelling of 31134209 in words is "thirty-one million, one hundred thirty-four thousand, two hundred nine".