31481873 has 4 divisors (see below), whose sum is σ = 31655988. Its totient is φ = 31307760.

The previous prime is 31481867. The next prime is 31481887. The reversal of 31481873 is 37818413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37818413 = 2441 ⋅15493.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 18464209 = 3608^2 + 4297^2 .

It is a cyclic number.

It is not a de Polignac number, because 31481873 - 2¹⁰ = 31480849 is a prime.

It is a super-2 number, since 2×31481873² = 1982216655176258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31481843) 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, 86786 + ... + 87147.

It is an arithmetic number, because the mean of its divisors is an integer number (7913997).

Almost surely, 2^31481873 is an apocalyptic number.

It is an amenable number.

31481873 is a deficient number, since it is larger than the sum of its proper divisors (174115).

31481873 is a wasteful number, since it uses less digits than its factorization.

31481873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174114.

The product of its digits is 16128, while the sum is 35.

The square root of 31481873 is about 5610.8709662583. The cubic root of 31481873 is about 315.7573880203.

The spelling of 31481873 in words is "thirty-one million, four hundred eighty-one thousand, eight hundred seventy-three".