611403643 has 2 divisors, whose sum is σ = 611403644. Its totient is φ = 611403642.

The previous prime is 611403557. The next prime is 611403659. The reversal of 611403643 is 346304116.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611403643 is a prime.

It is not a weakly prime, because it can be changed into another prime (611403343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305701821 + 305701822.

It is an arithmetic number, because the mean of its divisors is an integer number (305701822).

Almost surely, 2^611403643 is an apocalyptic number.

611403643 is a deficient number, since it is larger than the sum of its proper divisors (1).

611403643 is an equidigital number, since it uses as much as digits as its factorization.

611403643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 611403643 is about 24726.5776645293. The cubic root of 611403643 is about 848.7426128631.

Adding to 611403643 its reverse (346304116), we get a palindrome (957707759).

The spelling of 611403643 in words is "six hundred eleven million, four hundred three thousand, six hundred forty-three".