1821115097 has 8 divisors (see below), whose sum is σ = 1923213600. Its totient is φ = 1719641664.

The previous prime is 1821115061. The next prime is 1821115129. The reversal of 1821115097 is 7905111281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1821115097 - 2¹⁶ = 1821049561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1821115397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150272 + ... + 161937.

It is an arithmetic number, because the mean of its divisors is an integer number (240401700).

Almost surely, 2^1821115097 is an apocalyptic number.

It is an amenable number.

1821115097 is a deficient number, since it is larger than the sum of its proper divisors (102098503).

1821115097 is a wasteful number, since it uses less digits than its factorization.

1821115097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312535.

The product of its (nonzero) digits is 5040, while the sum is 35.

The square root of 1821115097 is about 42674.5251526013. The cubic root of 1821115097 is about 1221.1784494678.

The spelling of 1821115097 in words is "one billion, eight hundred twenty-one million, one hundred fifteen thousand, ninety-seven".