31063381 has 4 divisors (see below), whose sum is σ = 31724352. Its totient is φ = 30402412.

The previous prime is 31063367. The next prime is 31063391. The reversal of 31063381 is 18336013.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18336013 = 17 ⋅1078589.

It is a cyclic number.

It is not a de Polignac number, because 31063381 - 2⁵ = 31063349 is a prime.

It is a super-2 number, since 2×31063381² = 1929867278302322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31063391) 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, 330415 + ... + 330508.

It is an arithmetic number, because the mean of its divisors is an integer number (7931088).

Almost surely, 2^31063381 is an apocalyptic number.

It is an amenable number.

31063381 is a deficient number, since it is larger than the sum of its proper divisors (660971).

31063381 is an equidigital number, since it uses as much as digits as its factorization.

31063381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660970.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31063381 is about 5573.4532383434. The cubic root of 31063381 is about 314.3520096570.

Adding to 31063381 its reverse (18336013), we get a palindrome (49399394).

The spelling of 31063381 in words is "thirty-one million, sixty-three thousand, three hundred eighty-one".