811519493 has 2 divisors, whose sum is σ = 811519494. Its totient is φ = 811519492.

The previous prime is 811519487. The next prime is 811519559. The reversal of 811519493 is 394915118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489604129 + 321915364 = 22127^2 + 17942^2 .

It is a cyclic number.

It is not a de Polignac number, because 811519493 - 2⁸ = 811519237 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 811519493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811516493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405759746 + 405759747.

It is an arithmetic number, because the mean of its divisors is an integer number (405759747).

Almost surely, 2^811519493 is an apocalyptic number.

It is an amenable number.

811519493 is a deficient number, since it is larger than the sum of its proper divisors (1).

811519493 is an equidigital number, since it uses as much as digits as its factorization.

811519493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 811519493 is about 28487.1812048858. The cubic root of 811519493 is about 932.7522787967.

The spelling of 811519493 in words is "eight hundred eleven million, five hundred nineteen thousand, four hundred ninety-three".