31421875 has 14 divisors (see below), whose sum is σ = 39296372. Its totient is φ = 25125000.

The previous prime is 31421869. The next prime is 31421881. The reversal of 31421875 is 57812413.

It is an interprime number because it is at equal distance from previous prime (31421869) and next prime (31421881).

It is not a de Polignac number, because 31421875 - 2¹⁷ = 31290803 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 14620 + ... + 16630.

Almost surely, 2^31421875 is an apocalyptic number.

31421875 is a deficient number, since it is larger than the sum of its proper divisors (7874497).

31421875 is an frugal number, since it uses more digits than its factorization.

31421875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041 (or 2016 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 31421875 is about 5605.5218311947. The cubic root of 31421875 is about 315.5566708276.

The spelling of 31421875 in words is "thirty-one million, four hundred twenty-one thousand, eight hundred seventy-five".