31585421 has 16 divisors (see below), whose sum is σ = 36983424. Its totient is φ = 26417664.

The previous prime is 31585399. The next prime is 31585441. The reversal of 31585421 is 12458513.

It is not a de Polignac number, because 31585421 - 2¹⁴ = 31569037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31585441) 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, 57470 + ... + 58016.

It is an arithmetic number, because the mean of its divisors is an integer number (2311464).

Almost surely, 2^31585421 is an apocalyptic number.

It is an amenable number.

31585421 is a deficient number, since it is larger than the sum of its proper divisors (5398003).

31585421 is a wasteful number, since it uses less digits than its factorization.

31585421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its digits is 4800, while the sum is 29.

The square root of 31585421 is about 5620.0908355648. The cubic root of 31585421 is about 316.1031982816.

The spelling of 31585421 in words is "thirty-one million, five hundred eighty-five thousand, four hundred twenty-one".