61231 has 2 divisors, whose sum is σ = 61232. Its totient is φ = 61230.

The previous prime is 61223. The next prime is 61253. The reversal of 61231 is 13216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61231 - 2³ = 61223 is a prime.

It is a super-2 number, since 2×61231² = 7498470722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30615 + 30616.

It is an arithmetic number, because the mean of its divisors is an integer number (30616).

2⁶¹²³¹ is an apocalyptic number.

61231 is the 157-th centered pentagonal number.

61231 is a deficient number, since it is larger than the sum of its proper divisors (1).

61231 is an equidigital number, since it uses as much as digits as its factorization.

61231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 13.

The square root of 61231 is about 247.4489846413. The cubic root of 61231 is about 39.4145994493.

Adding to 61231 its reverse (13216), we get a palindrome (74447).

It can be divided in two parts, 61 and 231, that added together give a palindrome (292).

The spelling of 61231 in words is "sixty-one thousand, two hundred thirty-one".