31480509 has 4 divisors (see below), whose sum is σ = 41974016. Its totient is φ = 20987004.

The previous prime is 31480507. The next prime is 31480529. The reversal of 31480509 is 90508413.

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 31480509 - 2¹ = 31480507 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 (31480507) 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, 5246749 + ... + 5246754.

It is an arithmetic number, because the mean of its divisors is an integer number (10493504).

Almost surely, 2^31480509 is an apocalyptic number.

It is an amenable number.

31480509 is a deficient number, since it is larger than the sum of its proper divisors (10493507).

31480509 is a wasteful number, since it uses less digits than its factorization.

31480509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10493506.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 31480509 is about 5610.7494151851. The cubic root of 31480509 is about 315.7528277315.

The spelling of 31480509 in words is "thirty-one million, four hundred eighty thousand, five hundred nine".