511455491 has 2 divisors, whose sum is σ = 511455492. Its totient is φ = 511455490.

The previous prime is 511455481. The next prime is 511455521. The reversal of 511455491 is 194554115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 511455491 - 2¹⁰ = 511454467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (511455431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255727745 + 255727746.

It is an arithmetic number, because the mean of its divisors is an integer number (255727746).

Almost surely, 2^511455491 is an apocalyptic number.

511455491 is a deficient number, since it is larger than the sum of its proper divisors (1).

511455491 is an equidigital number, since it uses as much as digits as its factorization.

511455491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 35.

The square root of 511455491 is about 22615.3817345629. The cubic root of 511455491 is about 799.7163009680.

The spelling of 511455491 in words is "five hundred eleven million, four hundred fifty-five thousand, four hundred ninety-one".