31473993 has 4 divisors (see below), whose sum is σ = 41965328. Its totient is φ = 20982660.

The previous prime is 31473991. The next prime is 31474007. The reversal of 31473993 is 39937413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39937413 = 3 ⋅13312471.

It is not a de Polignac number, because 31473993 - 2¹ = 31473991 is a prime.

It is a super-2 number, since 2×31473993² = 1981224470728098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31473991) 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, 5245663 + ... + 5245668.

It is an arithmetic number, because the mean of its divisors is an integer number (10491332).

Almost surely, 2^31473993 is an apocalyptic number.

It is an amenable number.

31473993 is a deficient number, since it is larger than the sum of its proper divisors (10491335).

31473993 is a wasteful number, since it uses less digits than its factorization.

31473993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10491334.

The product of its digits is 61236, while the sum is 39.

The square root of 31473993 is about 5610.1687140406. The cubic root of 31473993 is about 315.7310408390.

It can be divided in two parts, 3147 and 3993, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 31473993 in words is "thirty-one million, four hundred seventy-three thousand, nine hundred ninety-three".