31171071 has 4 divisors (see below), whose sum is σ = 41561432. Its totient is φ = 20780712.

The previous prime is 31171069. The next prime is 31171103. The reversal of 31171071 is 17017113.

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

It is not a de Polignac number, because 31171071 - 2¹ = 31171069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31171031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5195176 + ... + 5195181.

It is an arithmetic number, because the mean of its divisors is an integer number (10390358).

Almost surely, 2^31171071 is an apocalyptic number.

31171071 is a deficient number, since it is larger than the sum of its proper divisors (10390361).

31171071 is a wasteful number, since it uses less digits than its factorization.

31171071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10390360.

The product of its (nonzero) digits is 147, while the sum is 21.

The square root of 31171071 is about 5583.1058560626. The cubic root of 31171071 is about 314.7148540755.

Adding to 31171071 its reverse (17017113), we get a palindrome (48188184).

The spelling of 31171071 in words is "thirty-one million, one hundred seventy-one thousand, seventy-one".