31421983 has 4 divisors (see below), whose sum is σ = 31586688. Its totient is φ = 31257280.

The previous prime is 31421981. The next prime is 31421987. The reversal of 31421983 is 38912413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38912413 = 3511 ⋅11083.

It is a cyclic number.

It is not a de Polignac number, because 31421983 - 2¹ = 31421981 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421981) 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, 82066 + ... + 82447.

It is an arithmetic number, because the mean of its divisors is an integer number (7896672).

Almost surely, 2^31421983 is an apocalyptic number.

31421983 is a deficient number, since it is larger than the sum of its proper divisors (164705).

31421983 is a wasteful number, since it uses less digits than its factorization.

31421983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164704.

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

The square root of 31421983 is about 5605.5314645446. The cubic root of 31421983 is about 315.5570323601.

The spelling of 31421983 in words is "thirty-one million, four hundred twenty-one thousand, nine hundred eighty-three".