611117831 has 2 divisors, whose sum is σ = 611117832. Its totient is φ = 611117830.

The previous prime is 611117747. The next prime is 611117861. The reversal of 611117831 is 138711116.

611117831 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 a de Polignac number, because none of the positive numbers 2^k-611117831 is a prime.

It is a super-2 number, since 2×611117831² = 746930006732289122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 611117794 and 611117803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611117861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305558915 + 305558916.

It is an arithmetic number, because the mean of its divisors is an integer number (305558916).

Almost surely, 2^611117831 is an apocalyptic number.

611117831 is a deficient number, since it is larger than the sum of its proper divisors (1).

611117831 is an equidigital number, since it uses as much as digits as its factorization.

611117831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 29.

The square root of 611117831 is about 24720.7975397235. The cubic root of 611117831 is about 848.6103387450.

Adding to 611117831 its reverse (138711116), we get a palindrome (749828947).

The spelling of 611117831 in words is "six hundred eleven million, one hundred seventeen thousand, eight hundred thirty-one".