918981657 has 12 divisors (see below), whose sum is σ = 1448092464. Its totient is φ = 556958520.

The previous prime is 918981601. The next prime is 918981671. The reversal of 918981657 is 756189819.

It is not a de Polignac number, because 918981657 - 2¹⁰ = 918980633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (918981677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4641223 + ... + 4641420.

It is an arithmetic number, because the mean of its divisors is an integer number (120674372).

Almost surely, 2^918981657 is an apocalyptic number.

It is an amenable number.

918981657 is a deficient number, since it is larger than the sum of its proper divisors (529110807).

918981657 is a wasteful number, since it uses less digits than its factorization.

918981657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282660 (or 9282657 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 918981657 is about 30314.7102410694. The cubic root of 918981657 is about 972.2298426386.

The spelling of 918981657 in words is "nine hundred eighteen million, nine hundred eighty-one thousand, six hundred fifty-seven".