618801091 has 4 divisors (see below), whose sum is σ = 618969384. Its totient is φ = 618632800.

The previous prime is 618801077. The next prime is 618801109. The reversal of 618801091 is 190108816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 618801091 - 2¹¹ = 618799043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618801041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78505 + ... + 86026.

It is an arithmetic number, because the mean of its divisors is an integer number (154742346).

Almost surely, 2^618801091 is an apocalyptic number.

618801091 is a deficient number, since it is larger than the sum of its proper divisors (168293).

618801091 is a wasteful number, since it uses less digits than its factorization.

618801091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168292.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 618801091 is about 24875.7128742072. The cubic root of 618801091 is about 852.1519135725.

The spelling of 618801091 in words is "six hundred eighteen million, eight hundred one thousand, ninety-one".