Search a number
-
+
31156 = 227789

31156 has 6 divisors (see below), whose sum is σ = 54530. Its totient is φ = 15576.

The previous prime is 31153. The next prime is 31159. The reversal of 31156 is 65113.

It is an interprime number because it is at equal distance from previous prime (31153) and next prime (31159).

It can be written as a sum of positive squares in only one way, i.e., 27556 + 3600 = 166^2 + 60^2 .

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3891 + ... + 3898.

231156 is an apocalyptic number.

It is an amenable number.

31156 is a deficient number, since it is larger than the sum of its proper divisors (23374).

31156 is a wasteful number, since it uses less digits than its factorization.

31156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793 (or 7791 counting only the distinct ones).

The product of its digits is 90, while the sum is 16.

The square root of 31156 is about 176.5106229098. The cubic root of 31156 is about 31.4664125071.

Adding to 31156 its reverse (65113), we get a palindrome (96269).

The spelling of 31156 in words is "thirty-one thousand, one hundred fifty-six".

Divisors: 1 2 4 7789 15578 31156