611531 has 2 divisors, whose sum is σ = 611532. Its totient is φ = 611530.

The previous prime is 611497. The next prime is 611543. The reversal of 611531 is 135116.

611531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 611531 - 2⁶ = 611467 is a prime.

It is a super-2 number, since 2×611531² = 747940327922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (611551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305765 + 305766.

It is an arithmetic number, because the mean of its divisors is an integer number (305766).

2⁶¹¹⁵³¹ is an apocalyptic number.

611531 is a deficient number, since it is larger than the sum of its proper divisors (1).

611531 is an equidigital number, since it uses as much as digits as its factorization.

611531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90, while the sum is 17.

The square root of 611531 is about 782.0044756905. The cubic root of 611531 is about 84.8801540551.

Adding to 611531 its reverse (135116), we get a palindrome (746647).

The spelling of 611531 in words is "six hundred eleven thousand, five hundred thirty-one".