31421504 has 28 divisors (see below), whose sum is σ = 62982348. Its totient is φ = 15552000.

The previous prime is 31421479. The next prime is 31421557. The reversal of 31421504 is 40512413.

It can be written as a sum of positive squares in 2 ways, for example, as 29593600 + 1827904 = 5440^2 + 1352^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4034 + ... + 8894.

Almost surely, 2^31421504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31421504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31491174).

31421504 is an abundant number, since it is smaller than the sum of its proper divisors (31560844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31421504 is a wasteful number, since it uses less digits than its factorization.

31421504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974 (or 4964 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 31421504 is about 5605.4887387274. The cubic root of 31421504 is about 315.5554288905. Note that the first 3 decimals are identical.

Adding to 31421504 its reverse (40512413), we get a palindrome (71933917).

Subtracting 31421504 from its reverse (40512413), we obtain a palindrome (9090909).

The spelling of 31421504 in words is "thirty-one million, four hundred twenty-one thousand, five hundred four".