31147 has 2 divisors, whose sum is σ = 31148. Its totient is φ = 31146.

The previous prime is 31139. The next prime is 31151. The reversal of 31147 is 74113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31147 - 2³ = 31139 is a prime.

31147 is a lucky number.

It is a plaindrome in base 13 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 31147.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31147.

It is not a weakly prime, because it can be changed into another prime (31177) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15573 + 15574.

It is an arithmetic number, because the mean of its divisors is an integer number (15574).

2³¹¹⁴⁷ is an apocalyptic number.

31147 is a deficient number, since it is larger than the sum of its proper divisors (1).

31147 is an equidigital number, since it uses as much as digits as its factorization.

31147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84, while the sum is 16.

The square root of 31147 is about 176.4851268521. The cubic root of 31147 is about 31.4633823258.

The spelling of 31147 in words is "thirty-one thousand, one hundred forty-seven".