1863221545 has 8 divisors (see below), whose sum is σ = 2236713480. Its totient is φ = 1490012160.

The previous prime is 1863221537. The next prime is 1863221587. The reversal of 1863221545 is 5451223681.

It can be written as a sum of positive squares in 4 ways, for example, as 170145936 + 1693075609 = 13044^2 + 41147^2 .

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

It is not a de Polignac number, because 1863221545 - 2³ = 1863221537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55846 + ... + 82735.

It is an arithmetic number, because the mean of its divisors is an integer number (279589185).

Almost surely, 2^1863221545 is an apocalyptic number.

It is an amenable number.

1863221545 is a deficient number, since it is larger than the sum of its proper divisors (373491935).

1863221545 is a wasteful number, since it uses less digits than its factorization.

1863221545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141275.

The product of its digits is 57600, while the sum is 37.

The square root of 1863221545 is about 43165.0500405131. The cubic root of 1863221545 is about 1230.5185521478.

The spelling of 1863221545 in words is "one billion, eight hundred sixty-three million, two hundred twenty-one thousand, five hundred forty-five".