1863221497 has 8 divisors (see below), whose sum is σ = 1885480200. Its totient is φ = 1840992384.

The previous prime is 1863221483. The next prime is 1863221527. The reversal of 1863221497 is 7941223681.

It can be written as a sum of positive squares in 4 ways, for example, as 90601 + 1863130896 = 301^2 + 43164^2 .

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 1863221497 - 2¹⁹ = 1862697209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1863221417) 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, 135579 + ... + 148687.

It is an arithmetic number, because the mean of its divisors is an integer number (235685025).

Almost surely, 2^1863221497 is an apocalyptic number.

It is an amenable number.

1863221497 is a deficient number, since it is larger than the sum of its proper divisors (22258703).

1863221497 is a wasteful number, since it uses less digits than its factorization.

1863221497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14795.

The product of its digits is 145152, while the sum is 43.

The square root of 1863221497 is about 43165.0494845077. The cubic root of 1863221497 is about 1230.5185415810.

The spelling of 1863221497 in words is "one billion, eight hundred sixty-three million, two hundred twenty-one thousand, four hundred ninety-seven".