1820521097 has 8 divisors (see below), whose sum is σ = 1879756032. Its totient is φ = 1761318000.

The previous prime is 1820521091. The next prime is 1820521099. The reversal of 1820521097 is 7901250281.

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

It is a cyclic number.

It is not a de Polignac number, because 1820521097 - 2⁶ = 1820521033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820521091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176363 + ... + 186399.

It is an arithmetic number, because the mean of its divisors is an integer number (234969504).

Almost surely, 2^1820521097 is an apocalyptic number.

It is an amenable number.

1820521097 is a deficient number, since it is larger than the sum of its proper divisors (59234935).

1820521097 is a wasteful number, since it uses less digits than its factorization.

1820521097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15919.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 1820521097 is about 42667.5649293465. The cubic root of 1820521097 is about 1221.0456628981.

The spelling of 1820521097 in words is "one billion, eight hundred twenty million, five hundred twenty-one thousand, ninety-seven".