611530643 has 2 divisors, whose sum is σ = 611530644. Its totient is φ = 611530642.

The previous prime is 611530609. The next prime is 611530651. The reversal of 611530643 is 346035116.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611530643 is a prime.

It is not a weakly prime, because it can be changed into another prime (611530243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305765321 + 305765322.

It is an arithmetic number, because the mean of its divisors is an integer number (305765322).

Almost surely, 2^611530643 is an apocalyptic number.

611530643 is a deficient number, since it is larger than the sum of its proper divisors (1).

611530643 is an equidigital number, since it uses as much as digits as its factorization.

611530643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 611530643 is about 24729.1456180758. The cubic root of 611530643 is about 848.8013753793.

Adding to 611530643 its reverse (346035116), we get a palindrome (957565759).

The spelling of 611530643 in words is "six hundred eleven million, five hundred thirty thousand, six hundred forty-three".