805891123 has 2 divisors, whose sum is σ = 805891124. Its totient is φ = 805891122.

The previous prime is 805891067. The next prime is 805891133. The reversal of 805891123 is 321198508.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-805891123 is a prime.

It is a super-2 number, since 2×805891123² = 1298921004260402258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (805891133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402945561 + 402945562.

It is an arithmetic number, because the mean of its divisors is an integer number (402945562).

Almost surely, 2^805891123 is an apocalyptic number.

805891123 is a deficient number, since it is larger than the sum of its proper divisors (1).

805891123 is an equidigital number, since it uses as much as digits as its factorization.

805891123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 805891123 is about 28388.2215540178. The cubic root of 805891123 is about 930.5908770590.

The spelling of 805891123 in words is "eight hundred five million, eight hundred ninety-one thousand, one hundred twenty-three".