511402561 has 2 divisors, whose sum is σ = 511402562. Its totient is φ = 511402560.

The previous prime is 511402547. The next prime is 511402579. The reversal of 511402561 is 165204115.

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., 476592561 + 34810000 = 21831^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 511402561 - 2⁷ = 511402433 is a prime.

It is not a weakly prime, because it can be changed into another prime (511402531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255701280 + 255701281.

It is an arithmetic number, because the mean of its divisors is an integer number (255701281).

Almost surely, 2^511402561 is an apocalyptic number.

It is an amenable number.

511402561 is a deficient number, since it is larger than the sum of its proper divisors (1).

511402561 is an equidigital number, since it uses as much as digits as its factorization.

511402561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 511402561 is about 22614.2114830476. The cubic root of 511402561 is about 799.6887127452.

Adding to 511402561 its reverse (165204115), we get a palindrome (676606676).

The spelling of 511402561 in words is "five hundred eleven million, four hundred two thousand, five hundred sixty-one".