821090519 has 2 divisors, whose sum is σ = 821090520. Its totient is φ = 821090518.

The previous prime is 821090513. The next prime is 821090533. The reversal of 821090519 is 915090128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821090519 - 2¹² = 821086423 is a prime.

It is a super-2 number, since 2×821090519² = 1348379280783378722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821090513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410545259 + 410545260.

It is an arithmetic number, because the mean of its divisors is an integer number (410545260).

Almost surely, 2^821090519 is an apocalyptic number.

821090519 is a deficient number, since it is larger than the sum of its proper divisors (1).

821090519 is an equidigital number, since it uses as much as digits as its factorization.

821090519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 821090519 is about 28654.6770876937. The cubic root of 821090519 is about 936.4049033330.

The spelling of 821090519 in words is "eight hundred twenty-one million, ninety thousand, five hundred nineteen".