618085381 has 6 divisors (see below), whose sum is σ = 640134482. Its totient is φ = 596771280.

The previous prime is 618085327. The next prime is 618085399. The reversal of 618085381 is 183580816.

It can be written as a sum of positive squares in 3 ways, for example, as 270076356 + 348009025 = 16434^2 + 18655^2 .

It is not a de Polignac number, because 618085381 - 2¹⁵ = 618052613 is a prime.

It is a super-2 number, since 2×618085381² = 764059076411830322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618085081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 366630 + ... + 368311.

Almost surely, 2^618085381 is an apocalyptic number.

It is an amenable number.

618085381 is a deficient number, since it is larger than the sum of its proper divisors (22049101).

618085381 is an equidigital number, since it uses as much as digits as its factorization.

618085381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734999 (or 734970 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 618085381 is about 24861.3229937588. The cubic root of 618085381 is about 851.8232517230.

The spelling of 618085381 in words is "six hundred eighteen million, eighty-five thousand, three hundred eighty-one".