31383481 has 4 divisors (see below), whose sum is σ = 32465700. Its totient is φ = 30301264.

The previous prime is 31383467. The next prime is 31383487. The reversal of 31383481 is 18438313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18438313 = 769 ⋅23977.

It can be written as a sum of positive squares in 2 ways, for example, as 10989225 + 20394256 = 3315^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 31383481 - 2¹¹ = 31381433 is a prime.

It is a super-2 number, since 2×31383481² = 1969845759354722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31383487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541066 + ... + 541123.

It is an arithmetic number, because the mean of its divisors is an integer number (8116425).

Almost surely, 2^31383481 is an apocalyptic number.

It is an amenable number.

31383481 is a deficient number, since it is larger than the sum of its proper divisors (1082219).

31383481 is a wasteful number, since it uses less digits than its factorization.

31383481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082218.

The product of its digits is 6912, while the sum is 31.

The square root of 31383481 is about 5602.0961255587. The cubic root of 31383481 is about 315.4280935148.

The spelling of 31383481 in words is "thirty-one million, three hundred eighty-three thousand, four hundred eighty-one".