618941639 has 2 divisors, whose sum is σ = 618941640. Its totient is φ = 618941638.

The previous prime is 618941623. The next prime is 618941647. The reversal of 618941639 is 936149816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 618941639 - 2⁴ = 618941623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 618941593 and 618941602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618961639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309470819 + 309470820.

It is an arithmetic number, because the mean of its divisors is an integer number (309470820).

Almost surely, 2^618941639 is an apocalyptic number.

618941639 is a deficient number, since it is larger than the sum of its proper divisors (1).

618941639 is an equidigital number, since it uses as much as digits as its factorization.

618941639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 618941639 is about 24878.5377182824. The cubic root of 618941639 is about 852.2164249760.

The spelling of 618941639 in words is "six hundred eighteen million, nine hundred forty-one thousand, six hundred thirty-nine".