31145263 has 4 divisors (see below), whose sum is σ = 31156488. Its totient is φ = 31134040.

The previous prime is 31145227. The next prime is 31145293. The reversal of 31145263 is 36254113.

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: 36254113 = 7 ⋅5179159.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31145263 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 (31145293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920 + ... + 8122.

It is an arithmetic number, because the mean of its divisors is an integer number (7789122).

Almost surely, 2^31145263 is an apocalyptic number.

31145263 is a deficient number, since it is larger than the sum of its proper divisors (11225).

31145263 is an equidigital number, since it uses as much as digits as its factorization.

31145263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224.

The product of its digits is 2160, while the sum is 25.

The square root of 31145263 is about 5580.7941191196. The cubic root of 31145263 is about 314.6279743363.

Adding to 31145263 its reverse (36254113), we get a palindrome (67399376).

The spelling of 31145263 in words is "thirty-one million, one hundred forty-five thousand, two hundred sixty-three".