31013005 has 4 divisors (see below), whose sum is σ = 37215612. Its totient is φ = 24810400.

The previous prime is 31012973. The next prime is 31013023. The reversal of 31013005 is 50031013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19193161 + 11819844 = 4381^2 + 3438^2 .

It is not a de Polignac number, because 31013005 - 2⁵ = 31012973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3101296 + ... + 3101305.

It is an arithmetic number, because the mean of its divisors is an integer number (9303903).

Almost surely, 2^31013005 is an apocalyptic number.

It is an amenable number.

31013005 is a deficient number, since it is larger than the sum of its proper divisors (6202607).

31013005 is an equidigital number, since it uses as much as digits as its factorization.

31013005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6202606.

The product of its (nonzero) digits is 45, while the sum is 13.

The square root of 31013005 is about 5568.9321238456. The cubic root of 31013005 is about 314.1819877593.

Adding to 31013005 its reverse (50031013), we get a palindrome (81044018).

The spelling of 31013005 in words is "thirty-one million, thirteen thousand, five".