31030509 has 4 divisors (see below), whose sum is σ = 41374016. Its totient is φ = 20687004.

The previous prime is 31030487. The next prime is 31030511. The reversal of 31030509 is 90503013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31030509 - 2¹¹ = 31028461 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 (31030529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5171749 + ... + 5171754.

It is an arithmetic number, because the mean of its divisors is an integer number (10343504).

Almost surely, 2^31030509 is an apocalyptic number.

It is an amenable number.

31030509 is a deficient number, since it is larger than the sum of its proper divisors (10343507).

31030509 is a wasteful number, since it uses less digits than its factorization.

31030509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343506.

The product of its (nonzero) digits is 405, while the sum is 21.

The square root of 31030509 is about 5570.5034781427. The cubic root of 31030509 is about 314.2410856248.

The spelling of 31030509 in words is "thirty-one million, thirty thousand, five hundred nine".