31942009 has 16 divisors (see below), whose sum is σ = 36578304. Its totient is φ = 27610000.

The previous prime is 31942007. The next prime is 31942019. The reversal of 31942009 is 90024913.

It is a happy number.

It is not a de Polignac number, because 31942009 - 2¹ = 31942007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31942007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63252 + ... + 63754.

It is an arithmetic number, because the mean of its divisors is an integer number (2286144).

Almost surely, 2^31942009 is an apocalyptic number.

It is an amenable number.

31942009 is a deficient number, since it is larger than the sum of its proper divisors (4636295).

31942009 is a wasteful number, since it uses less digits than its factorization.

31942009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31942009 is about 5651.7261964819. The cubic root of 31942009 is about 317.2883132304.

The spelling of 31942009 in words is "thirty-one million, nine hundred forty-two thousand, nine".