816111031 has 2 divisors, whose sum is σ = 816111032. Its totient is φ = 816111030.

The previous prime is 816110947. The next prime is 816111041. The reversal of 816111031 is 130111618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816111031 - 2¹¹ = 816108983 is a prime.

It is a super-2 number, since 2×816111031² = 1332074429839765922, 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 = 816110993 and 816111011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816111041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408055515 + 408055516.

It is an arithmetic number, because the mean of its divisors is an integer number (408055516).

Almost surely, 2^816111031 is an apocalyptic number.

816111031 is a deficient number, since it is larger than the sum of its proper divisors (1).

816111031 is an equidigital number, since it uses as much as digits as its factorization.

816111031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 816111031 is about 28567.6570792916. The cubic root of 816111031 is about 934.5081271909.

Adding to 816111031 its reverse (130111618), we get a palindrome (946222649).

The spelling of 816111031 in words is "eight hundred sixteen million, one hundred eleven thousand, thirty-one".