191023069 has 2 divisors, whose sum is σ = 191023070. Its totient is φ = 191023068.

The previous prime is 191023057. The next prime is 191023121. The reversal of 191023069 is 960320191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159719044 + 31304025 = 12638^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 191023069 - 2⁵ = 191023037 is a prime.

It is a super-2 number, since 2×191023069² = 72979625780357522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191023069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191023039) 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, 95511534 + 95511535.

It is an arithmetic number, because the mean of its divisors is an integer number (95511535).

Almost surely, 2^191023069 is an apocalyptic number.

It is an amenable number.

191023069 is a deficient number, since it is larger than the sum of its proper divisors (1).

191023069 is an equidigital number, since it uses as much as digits as its factorization.

191023069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 191023069 is about 13821.1095430143. The cubic root of 191023069 is about 575.9197067299.

The spelling of 191023069 in words is "one hundred ninety-one million, twenty-three thousand, sixty-nine".