1642218791 has 8 divisors (see below), whose sum is σ = 1714055904. Its totient is φ = 1570418080.

The previous prime is 1642218779. The next prime is 1642218821. The reversal of 1642218791 is 1978122461.

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 1642218791 - 2³⁰ = 568476967 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 (1642218701) 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, 125825 + ... + 138261.

It is an arithmetic number, because the mean of its divisors is an integer number (214256988).

Almost surely, 2^1642218791 is an apocalyptic number.

1642218791 is a deficient number, since it is larger than the sum of its proper divisors (71837113).

1642218791 is a wasteful number, since it uses less digits than its factorization.

1642218791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18201.

The product of its digits is 48384, while the sum is 41.

The square root of 1642218791 is about 40524.2987724649. The cubic root of 1642218791 is about 1179.8052898589.

The spelling of 1642218791 in words is "one billion, six hundred forty-two million, two hundred eighteen thousand, seven hundred ninety-one".