921072769 has 2 divisors, whose sum is σ = 921072770. Its totient is φ = 921072768.

The previous prime is 921072751. The next prime is 921072791. The reversal of 921072769 is 967270129.

921072769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 825815169 + 95257600 = 28737^2 + 9760^2 .

It is a cyclic number.

It is not a de Polignac number, because 921072769 - 2²³ = 912684161 is a prime.

It is a super-2 number, since 2×921072769² = 1696750091586654722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (921076769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460536384 + 460536385.

It is an arithmetic number, because the mean of its divisors is an integer number (460536385).

Almost surely, 2^921072769 is an apocalyptic number.

It is an amenable number.

921072769 is a deficient number, since it is larger than the sum of its proper divisors (1).

921072769 is an equidigital number, since it uses as much as digits as its factorization.

921072769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 921072769 is about 30349.1806973434. The cubic root of 921072769 is about 972.9667095036.

The spelling of 921072769 in words is "nine hundred twenty-one million, seventy-two thousand, seven hundred sixty-nine".