611540231 has 2 divisors, whose sum is σ = 611540232. Its totient is φ = 611540230.

The previous prime is 611540221. The next prime is 611540257. The reversal of 611540231 is 132045116.

611540231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611540231 is a prime.

It is a super-2 number, since 2×611540231² = 747962908263066722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 611540197 and 611540206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611540221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305770115 + 305770116.

It is an arithmetic number, because the mean of its divisors is an integer number (305770116).

Almost surely, 2^611540231 is an apocalyptic number.

611540231 is a deficient number, since it is larger than the sum of its proper divisors (1).

611540231 is an equidigital number, since it uses as much as digits as its factorization.

611540231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 611540231 is about 24729.3394776326. The cubic root of 611540231 is about 848.8058113876.

Adding to 611540231 its reverse (132045116), we get a palindrome (743585347).

The spelling of 611540231 in words is "six hundred eleven million, five hundred forty thousand, two hundred thirty-one".