618661193 has 2 divisors, whose sum is σ = 618661194. Its totient is φ = 618661192.

The previous prime is 618661159. The next prime is 618661213. The reversal of 618661193 is 391166816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561310864 + 57350329 = 23692^2 + 7573^2 .

It is a cyclic number.

It is not a de Polignac number, because 618661193 - 2⁶ = 618661129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 618661193.

It is not a weakly prime, because it can be changed into another prime (618661993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309330596 + 309330597.

It is an arithmetic number, because the mean of its divisors is an integer number (309330597).

Almost surely, 2^618661193 is an apocalyptic number.

It is an amenable number.

618661193 is a deficient number, since it is larger than the sum of its proper divisors (1).

618661193 is an equidigital number, since it uses as much as digits as its factorization.

618661193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 618661193 is about 24872.9007757439. The cubic root of 618661193 is about 852.0876908170.

The spelling of 618661193 in words is "six hundred eighteen million, six hundred sixty-one thousand, one hundred ninety-three".