31487013 has 6 divisors (see below), whose sum is σ = 45481254. Its totient is φ = 20991336.

The previous prime is 31486999. The next prime is 31487021. The reversal of 31487013 is 31078413.

It can be written as a sum of positive squares in only one way, i.e., 16136289 + 15350724 = 4017^2 + 3918^2 .

It is not a de Polignac number, because 31487013 - 2⁵ = 31486981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31487033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1749270 + ... + 1749287.

It is an arithmetic number, because the mean of its divisors is an integer number (7580209).

Almost surely, 2^31487013 is an apocalyptic number.

It is an amenable number.

31487013 is a deficient number, since it is larger than the sum of its proper divisors (13994241).

31487013 is a wasteful number, since it uses less digits than its factorization.

31487013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498563 (or 3498560 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 31487013 is about 5611.3289869691. The cubic root of 31487013 is about 315.7745715029.

The spelling of 31487013 in words is "thirty-one million, four hundred eighty-seven thousand, thirteen".