1791221063 has 8 divisors (see below), whose sum is σ = 1798451328. Its totient is φ = 1784001024.

The previous prime is 1791221059. The next prime is 1791221077. The reversal of 1791221063 is 3601221971.

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 1791221063 - 2² = 1791221059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791221093) 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, 689495 + ... + 692087.

It is an arithmetic number, because the mean of its divisors is an integer number (224806416).

Almost surely, 2^1791221063 is an apocalyptic number.

1791221063 is a deficient number, since it is larger than the sum of its proper divisors (7230265).

1791221063 is a wasteful number, since it uses less digits than its factorization.

1791221063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5113.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1791221063 is about 42322.8196485064. The cubic root of 1791221063 is about 1214.4595728053.

The spelling of 1791221063 in words is "one billion, seven hundred ninety-one million, two hundred twenty-one thousand, sixty-three".