521230019 has 2 divisors, whose sum is σ = 521230020. Its totient is φ = 521230018.

The previous prime is 521229967. The next prime is 521230049. The reversal of 521230019 is 910032125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521230019 - 2⁸ = 521229763 is a prime.

It is a super-2 number, since 2×521230019² = 543361465413480722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521229976 and 521230003.

It is not a weakly prime, because it can be changed into another prime (521230049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260615009 + 260615010.

It is an arithmetic number, because the mean of its divisors is an integer number (260615010).

Almost surely, 2^521230019 is an apocalyptic number.

521230019 is a deficient number, since it is larger than the sum of its proper divisors (1).

521230019 is an equidigital number, since it uses as much as digits as its factorization.

521230019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 521230019 is about 22830.4625226910. The cubic root of 521230019 is about 804.7786997616.

The spelling of 521230019 in words is "five hundred twenty-one million, two hundred thirty thousand, nineteen".