1821934097 has 4 divisors (see below), whose sum is σ = 1866371556. Its totient is φ = 1777496640.

The previous prime is 1821934087. The next prime is 1821934151. The reversal of 1821934097 is 7904391281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7904391281 = 17 ⋅464964193.

It can be written as a sum of positive squares in 2 ways, for example, as 605947456 + 1215986641 = 24616^2 + 34871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1821934097 is a prime.

It is a super-2 number, since 2×1821934097² = 6638887707622410818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821934087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22218668 + ... + 22218749.

It is an arithmetic number, because the mean of its divisors is an integer number (466592889).

Almost surely, 2^1821934097 is an apocalyptic number.

It is an amenable number.

1821934097 is a deficient number, since it is larger than the sum of its proper divisors (44437459).

1821934097 is an equidigital number, since it uses as much as digits as its factorization.

1821934097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44437458.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1821934097 is about 42684.1199628152. The cubic root of 1821934097 is about 1221.3614866372.

The spelling of 1821934097 in words is "one billion, eight hundred twenty-one million, nine hundred thirty-four thousand, ninety-seven".