31142209 has 8 divisors (see below), whose sum is σ = 35696448. Its totient is φ = 26614320.

The previous prime is 31142183. The next prime is 31142213. The reversal of 31142209 is 90224113.

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 31142209 - 2⁹ = 31141697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31142209.

It is not an unprimeable number, because it can be changed into a prime (31142219) 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, 3982 + ... + 8839.

It is an arithmetic number, because the mean of its divisors is an integer number (4462056).

Almost surely, 2^31142209 is an apocalyptic number.

It is an amenable number.

31142209 is a deficient number, since it is larger than the sum of its proper divisors (4554239).

31142209 is a wasteful number, since it uses less digits than its factorization.

31142209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13175.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 31142209 is about 5580.5204954377. The cubic root of 31142209 is about 314.6176902123.

The spelling of 31142209 in words is "thirty-one million, one hundred forty-two thousand, two hundred nine".