1821366519 has 32 divisors (see below), whose sum is σ = 2966201856. Its totient is φ = 970383360.

The previous prime is 1821366509. The next prime is 1821366539. The reversal of 1821366519 is 9156631281.

It is not a de Polignac number, because 1821366519 - 2¹³ = 1821358327 is a prime.

It is a super-2 number, since 2×1821366519² = 6634751993068354722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821366509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14359 + ... + 62039.

It is an arithmetic number, because the mean of its divisors is an integer number (92693808).

Almost surely, 2^1821366519 is an apocalyptic number.

1821366519 is a deficient number, since it is larger than the sum of its proper divisors (1144835337).

1821366519 is a wasteful number, since it uses less digits than its factorization.

1821366519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47815.

The product of its digits is 77760, while the sum is 42.

The square root of 1821366519 is about 42677.4708599280. The cubic root of 1821366519 is about 1221.2346452569.

The spelling of 1821366519 in words is "one billion, eight hundred twenty-one million, three hundred sixty-six thousand, five hundred nineteen".