1819854459361 has 4 divisors (see below), whose sum is σ = 1828479362224. Its totient is φ = 1811229556500.

The previous prime is 1819854459343. The next prime is 1819854459461. The reversal of 1819854459361 is 1639544589181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1819854459361 - 2¹¹ = 1819854457313 is a prime.

It is a super-2 number, since 2×1819854459361² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1819854459293 and 1819854459302.

It is not an unprimeable number, because it can be changed into a prime (1819854459301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4312451115 + ... + 4312451536.

It is an arithmetic number, because the mean of its divisors is an integer number (457119840556).

Almost surely, 2^{1819854459361} is an apocalyptic number.

It is an amenable number.

1819854459361 is a deficient number, since it is larger than the sum of its proper divisors (8624902863).

1819854459361 is an equidigital number, since it uses as much as digits as its factorization.

1819854459361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8624902862.

The product of its digits is 37324800, while the sum is 64.

The spelling of 1819854459361 in words is "one trillion, eight hundred nineteen billion, eight hundred fifty-four million, four hundred fifty-nine thousand, three hundred sixty-one".