521964769 has 2 divisors, whose sum is σ = 521964770. Its totient is φ = 521964768.

The previous prime is 521964761. The next prime is 521964803. The reversal of 521964769 is 967469125.

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., 509630625 + 12334144 = 22575^2 + 3512^2 .

It is a cyclic number.

It is not a de Polignac number, because 521964769 - 2³ = 521964761 is a prime.

It is a super-2 number, since 2×521964769² = 544894440154446722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (521964761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260982384 + 260982385.

It is an arithmetic number, because the mean of its divisors is an integer number (260982385).

Almost surely, 2^521964769 is an apocalyptic number.

It is an amenable number.

521964769 is a deficient number, since it is larger than the sum of its proper divisors (1).

521964769 is an equidigital number, since it uses as much as digits as its factorization.

521964769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 521964769 is about 22846.5482950926. The cubic root of 521964769 is about 805.1566733363.

It can be divided in two parts, 52196 and 4769, that added together give a palindrome (56965).

The spelling of 521964769 in words is "five hundred twenty-one million, nine hundred sixty-four thousand, seven hundred sixty-nine".