618861413 has 2 divisors, whose sum is σ = 618861414. Its totient is φ = 618861412.

The previous prime is 618861403. The next prime is 618861433. The reversal of 618861413 is 314168816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608214244 + 10647169 = 24662^2 + 3263^2 .

It is a cyclic number.

It is not a de Polignac number, because 618861413 - 2²⁶ = 551752549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (618861403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 309430706 + 309430707.

It is an arithmetic number, because the mean of its divisors is an integer number (309430707).

Almost surely, 2^618861413 is an apocalyptic number.

It is an amenable number.

618861413 is a deficient number, since it is larger than the sum of its proper divisors (1).

618861413 is an equidigital number, since it uses as much as digits as its factorization.

618861413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 618861413 is about 24876.9253124256. The cubic root of 618861413 is about 852.1796025118.

The spelling of 618861413 in words is "six hundred eighteen million, eight hundred sixty-one thousand, four hundred thirteen".