891552769 has 2 divisors, whose sum is σ = 891552770. Its totient is φ = 891552768.

The previous prime is 891552763. The next prime is 891552791. The reversal of 891552769 is 967255198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728352144 + 163200625 = 26988^2 + 12775^2 .

It is a cyclic number.

It is not a de Polignac number, because 891552769 - 2¹⁷ = 891421697 is a prime.

It is a super-2 number, since 2×891552769² = 1589732679823134722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (891552763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445776384 + 445776385.

It is an arithmetic number, because the mean of its divisors is an integer number (445776385).

Almost surely, 2^891552769 is an apocalyptic number.

It is an amenable number.

891552769 is a deficient number, since it is larger than the sum of its proper divisors (1).

891552769 is an equidigital number, since it uses as much as digits as its factorization.

891552769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 52.

The square root of 891552769 is about 29858.8809066917. The cubic root of 891552769 is about 962.4592506277.

The spelling of 891552769 in words is "eight hundred ninety-one million, five hundred fifty-two thousand, seven hundred sixty-nine".