31313019 has 4 divisors (see below), whose sum is σ = 41750696. Its totient is φ = 20875344.

The previous prime is 31313017. The next prime is 31313039. The reversal of 31313019 is 91031313.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31313019 - 2¹ = 31313017 is a prime.

It is a super-2 number, since 2×31313019² = 1961010317788722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31312986 and 31313004.

It is not an unprimeable number, because it can be changed into a prime (31313017) 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, 5218834 + ... + 5218839.

It is an arithmetic number, because the mean of its divisors is an integer number (10437674).

Almost surely, 2^31313019 is an apocalyptic number.

31313019 is a deficient number, since it is larger than the sum of its proper divisors (10437677).

31313019 is a wasteful number, since it uses less digits than its factorization.

31313019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437676.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 31313019 is about 5595.8036956276. The cubic root of 31313019 is about 315.1918508795.

The spelling of 31313019 in words is "thirty-one million, three hundred thirteen thousand, nineteen".