31138463 has 4 divisors (see below), whose sum is σ = 31231200. Its totient is φ = 31045728.

The previous prime is 31138447. The next prime is 31138517. The reversal of 31138463 is 36483113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36483113 = 5119 ⋅7127.

It is a cyclic number.

It is not a de Polignac number, because 31138463 - 2⁴ = 31138447 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 (31138763) 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, 45863 + ... + 46536.

It is an arithmetic number, because the mean of its divisors is an integer number (7807800).

Almost surely, 2^31138463 is an apocalyptic number.

31138463 is a deficient number, since it is larger than the sum of its proper divisors (92737).

31138463 is an equidigital number, since it uses as much as digits as its factorization.

31138463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92736.

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

The square root of 31138463 is about 5580.1848535689. The cubic root of 31138463 is about 314.6050749102.

The spelling of 31138463 in words is "thirty-one million, one hundred thirty-eight thousand, four hundred sixty-three".