31421893 has 8 divisors (see below), whose sum is σ = 32045816. Its totient is φ = 30801600.

The previous prime is 31421881. The next prime is 31421939. The reversal of 31421893 is 39812413.

It can be written as a sum of positive squares in 4 ways, for example, as 252004 + 31169889 = 502^2 + 5583^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31421893 - 2¹⁷ = 31290821 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 (31421813) 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 7 ways as a sum of consecutive naturals, for example, 22063 + ... + 23443.

It is an arithmetic number, because the mean of its divisors is an integer number (4005727).

Almost surely, 2^31421893 is an apocalyptic number.

It is an amenable number.

31421893 is a deficient number, since it is larger than the sum of its proper divisors (623923).

31421893 is a wasteful number, since it uses less digits than its factorization.

31421893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815.

The product of its digits is 5184, while the sum is 31.

The square root of 31421893 is about 5605.5234367541. The cubic root of 31421893 is about 315.5567310831.

The spelling of 31421893 in words is "thirty-one million, four hundred twenty-one thousand, eight hundred ninety-three".