618989893 has 2 divisors, whose sum is σ = 618989894. Its totient is φ = 618989892.

The previous prime is 618989887. The next prime is 618989911. The reversal of 618989893 is 398989816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452115169 + 166874724 = 21263^2 + 12918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-618989893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618989843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309494946 + 309494947.

It is an arithmetic number, because the mean of its divisors is an integer number (309494947).

Almost surely, 2^618989893 is an apocalyptic number.

It is an amenable number.

618989893 is a deficient number, since it is larger than the sum of its proper divisors (1).

618989893 is an equidigital number, since it uses as much as digits as its factorization.

618989893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 61.

The square root of 618989893 is about 24879.5074911060. The cubic root of 618989893 is about 852.2385712658.

The spelling of 618989893 in words is "six hundred eighteen million, nine hundred eighty-nine thousand, eight hundred ninety-three".