31381463 has 4 divisors (see below), whose sum is σ = 31393320. Its totient is φ = 31369608.

The previous prime is 31381433. The next prime is 31381487. The reversal of 31381463 is 36418313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36418313 = 73 ⋅498881.

It is a cyclic number.

It is not a de Polignac number, because 31381463 - 2¹⁶ = 31315927 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 (31381403) 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, 56 + ... + 7922.

It is an arithmetic number, because the mean of its divisors is an integer number (7848330).

Almost surely, 2^31381463 is an apocalyptic number.

31381463 is a deficient number, since it is larger than the sum of its proper divisors (11857).

31381463 is an equidigital number, since it uses as much as digits as its factorization.

31381463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11856.

The product of its digits is 5184, while the sum is 29.

The square root of 31381463 is about 5601.9160115089. The cubic root of 31381463 is about 315.4213325531.

Adding to 31381463 its reverse (36418313), we get a palindrome (67799776).

The spelling of 31381463 in words is "thirty-one million, three hundred eighty-one thousand, four hundred sixty-three".