511105921 has 2 divisors, whose sum is σ = 511105922. Its totient is φ = 511105920.

The previous prime is 511105873. The next prime is 511105927. The reversal of 511105921 is 129501115.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 284934400 + 226171521 = 16880^2 + 15039^2 .

It is a cyclic number.

It is not a de Polignac number, because 511105921 - 2¹³ = 511097729 is a prime.

It is a super-2 number, since 2×511105921² = 522458524962516482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511105927) 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, 255552960 + 255552961.

It is an arithmetic number, because the mean of its divisors is an integer number (255552961).

Almost surely, 2^511105921 is an apocalyptic number.

It is an amenable number.

511105921 is a deficient number, since it is larger than the sum of its proper divisors (1).

511105921 is an equidigital number, since it uses as much as digits as its factorization.

511105921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 511105921 is about 22607.6518241059. The cubic root of 511105921 is about 799.5340625347.

The spelling of 511105921 in words is "five hundred eleven million, one hundred five thousand, nine hundred twenty-one".