1000891769 has 2 divisors, whose sum is σ = 1000891770. Its totient is φ = 1000891768.

The previous prime is 1000891763. The next prime is 1000891807. The reversal of 1000891769 is 9671980001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654745744 + 346146025 = 25588^2 + 18605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000891769 - 2¹² = 1000887673 is a prime.

It is a super-2 number, since 2×1000891769² = 2003568666503898722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1000891763) 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, 500445884 + 500445885.

It is an arithmetic number, because the mean of its divisors is an integer number (500445885).

Almost surely, 2^1000891769 is an apocalyptic number.

It is an amenable number.

1000891769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000891769 is an equidigital number, since it uses as much as digits as its factorization.

1000891769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1000891769 is about 31636.8735655090. The cubic root of 1000891769 is about 1000.2971680158.

The spelling of 1000891769 in words is "one billion, eight hundred ninety-one thousand, seven hundred sixty-nine".