618916819 has 2 divisors, whose sum is σ = 618916820. Its totient is φ = 618916818.

The previous prime is 618916813. The next prime is 618916873. The reversal of 618916819 is 918619816.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 618916819 - 2⁷ = 618916691 is a prime.

It is a super-2 number, since 2×618916819² = 766116057682157522, which contains 22 as substring.

618916819 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (618916813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309458409 + 309458410.

It is an arithmetic number, because the mean of its divisors is an integer number (309458410).

Almost surely, 2^618916819 is an apocalyptic number.

618916819 is a deficient number, since it is larger than the sum of its proper divisors (1).

618916819 is an equidigital number, since it uses as much as digits as its factorization.

618916819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 49.

The square root of 618916819 is about 24878.0388897517. The cubic root of 618916819 is about 852.2050333288.

The spelling of 618916819 in words is "six hundred eighteen million, nine hundred sixteen thousand, eight hundred nineteen".