31000071 has 16 divisors (see below), whose sum is σ = 42340320. Its totient is φ = 20167680.

The previous prime is 31000063. The next prime is 31000087. The reversal of 31000071 is 17000013.

It is not a de Polignac number, because 31000071 - 2³ = 31000063 is a prime.

It is a super-2 number, since 2×31000071² = 1922008804010082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000271) 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 15 ways as a sum of consecutive naturals, for example, 37915 + ... + 38723.

It is an arithmetic number, because the mean of its divisors is an integer number (2646270).

Almost surely, 2^31000071 is an apocalyptic number.

31000071 is a deficient number, since it is larger than the sum of its proper divisors (11340249).

31000071 is a wasteful number, since it uses less digits than its factorization.

31000071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106.

The product of its (nonzero) digits is 21, while the sum is 12.

The square root of 31000071 is about 5567.7707388146. The cubic root of 31000071 is about 314.1383050648.

Adding to 31000071 its reverse (17000013), we get a palindrome (48000084).

The spelling of 31000071 in words is "thirty-one million, seventy-one", and thus it is an aban number and an uban number.